{"id":17467,"date":"2026-03-23T20:17:44","date_gmt":"2026-03-23T14:47:44","guid":{"rendered":"https:\/\/www.oliveboard.in\/blog\/?p=17467"},"modified":"2026-03-23T20:23:18","modified_gmt":"2026-03-23T14:53:18","slug":"sbi-po-how-to-approach-sbi-po-simple-interest-problems","status":"publish","type":"post","link":"https:\/\/www.oliveboard.in\/blog\/sbi-po-how-to-approach-sbi-po-simple-interest-problems\/","title":{"rendered":"Master SBI PO Simple &amp; Compound Interest with Tricks &amp; Tips"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_77 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of content<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.oliveboard.in\/blog\/sbi-po-how-to-approach-sbi-po-simple-interest-problems\/#Understanding_Simple_and_Compound_Interest\" >Understanding Simple and Compound Interest<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.oliveboard.in\/blog\/sbi-po-how-to-approach-sbi-po-simple-interest-problems\/#Simple_and_Compound_Interest_Formulas\" >Simple and Compound Interest Formulas<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.oliveboard.in\/blog\/sbi-po-how-to-approach-sbi-po-simple-interest-problems\/#How_to_Solve_SI_CI_Problems_in_SBI_PO\" >How to Solve SI &amp; CI Problems in SBI PO?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.oliveboard.in\/blog\/sbi-po-how-to-approach-sbi-po-simple-interest-problems\/#Sample_Questions_with_Detailed_Solutions\" >Sample Questions with Detailed Solutions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.oliveboard.in\/blog\/sbi-po-how-to-approach-sbi-po-simple-interest-problems\/#Quick_Tips_and_Tricks_for_SBI_PO_SICI\" >Quick Tips and Tricks for SBI PO SI\/CI<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>Interest problems are a highly scoring topic in SBI PO exams. Simple and Compound Interest questions often appear in both Prelims and Mains. While they may look intimidating, most of these problems can be solved quickly if you know the formulas, shortcuts, and a systematic approach. This article explains what SI and CI are, the formulas, step-by-step solving methods, and sample questions with solutions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-understanding-simple-and-compound-interest\"><span class=\"ez-toc-section\" id=\"Understanding_Simple_and_Compound_Interest\"><\/span>Understanding Simple and Compound Interest<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Interest is the cost of borrowing or the gain from investing money. There are two types:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Simple Interest (SI):<\/strong> Calculated only on the original principal amount throughout the investment or loan period. It remains constant every year.<\/li>\n\n\n\n<li><strong>Compound Interest (CI):<\/strong> Calculated on the principal and accumulated interest. Each year, the interest is added to the principal, so the total grows faster.<\/li>\n<\/ul>\n\n\n\n<p>Understanding the difference between SI and CI is crucial, as exam questions often test this concept.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-16018d1d wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.oliveboard.in\/sbi-po-mock-test\/?ref=conttm-sbi-si\" target=\"_blank\" rel=\"noreferrer noopener\">Attempt a free SBI PO Mock test<\/a><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Simple_and_Compound_Interest_Formulas\"><\/span>Simple and Compound Interest Formulas<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Knowing the correct formulas is essential to solve any question accurately:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"680\" height=\"378\" src=\"https:\/\/www.oliveboard.in\/blog\/wp-content\/uploads\/2020\/08\/Simple-Interest.webp\" alt=\"Simple Interest\" class=\"wp-image-240181\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"777\" height=\"423\" src=\"https:\/\/www.oliveboard.in\/blog\/wp-content\/uploads\/2020\/08\/Compound-Interest.webp\" alt=\"Compound Interest\" class=\"wp-image-240182\" srcset=\"https:\/\/www.oliveboard.in\/blog\/wp-content\/uploads\/2020\/08\/Compound-Interest.webp 777w, https:\/\/www.oliveboard.in\/blog\/wp-content\/uploads\/2020\/08\/Compound-Interest-768x418.webp 768w\" sizes=\"auto, (max-width: 777px) 100vw, 777px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-to-solve-si-amp-ci-problems-in-sbi-po\"><span class=\"ez-toc-section\" id=\"How_to_Solve_SI_CI_Problems_in_SBI_PO\"><\/span>How to Solve SI &amp; CI Problems in SBI PO?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>To solve interest problems efficiently in exams, follow these steps:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Identify the type of interest:<\/strong> Determine whether the problem involves SI, CI, or the difference between them.<\/li>\n\n\n\n<li><strong>Extract the given values:<\/strong> Write down principal (P), rate (R), and time (T) clearly.<\/li>\n\n\n\n<li><strong>Choose the correct formula:<\/strong> Use SI formula for SI questions, CI formula for CI questions, and shortcuts for CI-SI differences.<\/li>\n\n\n\n<li><strong>Step-by-step calculation:<\/strong>\n<ul class=\"wp-block-list\">\n<li>For SI: Multiply P \u00d7 R \u00d7 T \u00f7 100<\/li>\n\n\n\n<li>For CI: Either use the formula or calculate year by year if it\u2019s mentally easier<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Use shortcuts whenever possible:<\/strong> Especially for 2\u20133 year CI vs SI differences.<\/li>\n\n\n\n<li><strong>Check the answer:<\/strong> CI must always be greater than SI; verify if the solution is reasonable.<\/li>\n\n\n\n<li><strong>Apply elimination:<\/strong> If options are widely apart, rough calculation may suffice.<\/li>\n<\/ol>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-16018d1d wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.oliveboard.in\/sbi-po\/?ref=conttm-sbi-si\" target=\"_blank\" rel=\"noreferrer noopener\">enroll in SBI PO Online coaching<\/a><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sample_Questions_with_Detailed_Solutions\"><\/span>Sample Questions with Detailed Solutions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Solve some practice questions for the SBI PO Quant.<\/p>\n\n\n\n<p><strong>Question 1:<\/strong> Find the difference between the compound interest and simple interest if Rs. 64,000 is lent at 10% per annum for 3 years.<\/p>\n\n\n\n<p><strong>Solution:<\/strong> Use the shortcut formula for CI-SI difference for 3 years: CI\u2212SI=P\u00d7(R100)2\u00d7(1+R100)=64000\u00d7(0.1)2\u00d71.1=1984CI &#8211; SI = P \\times \\left(\\frac{R}{100}\\right)^2 \\times \\left(1 + \\frac{R}{100}\\right) = 64000 \\times (0.1)^2 \\times 1.1 = 1984CI\u2212SI=P\u00d7(100R\u200b)2\u00d7(1+100R\u200b)=64000\u00d7(0.1)2\u00d71.1=1984<\/p>\n\n\n\n<p><strong>Answer:<\/strong> Rs. 1984<\/p>\n\n\n\n<p><strong>Question 2:<\/strong> A man invests in a scheme offering simple interest. The total amount received at the end of 4th year is Rs. 7984 and at the end of 5th year is Rs. 8108. Find the principal.<\/p>\n\n\n\n<p><strong>Solution:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Interest for 5th year = 8108 \u2013 7984 = 124<\/li>\n\n\n\n<li>Principal = Amount at 4th year \u2013 (SI for 4 years) = 7984 \u2013 (124 \u00d7 4) = 7488<\/li>\n<\/ul>\n\n\n\n<p><strong>Answer:<\/strong> Rs. 7488<\/p>\n\n\n\n<p><strong>Question 3:<\/strong> Amir invested Rs. 18,000 in a scheme offering 20% compound interest per annum for 2 years. Find the interest earned.<\/p>\n\n\n\n<p><strong>Solution:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Amount after 2 years: A=18000\u00d7(1+0.2)2=18000\u00d71.44=25920A = 18000 \\times (1 + 0.2)^2 = 18000 \\times 1.44 = 25920A=18000\u00d7(1+0.2)2=18000\u00d71.44=25920<\/li>\n\n\n\n<li>Compound Interest = 25920 \u2013 18000 = 7920<\/li>\n<\/ul>\n\n\n\n<p><strong>Answer:<\/strong> Rs. 7920<\/p>\n\n\n\n<p><strong>Question 4:<\/strong> Raman deposited Rs. 16,000 at 20% compound interest and Rs. 12,000 at 30% simple interest per annum. What will be the difference in the interest after 2 years?<\/p>\n\n\n\n<p><strong>Solution:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CI on Rs. 16,000 for 2 years: 16000 \u00d7 (1.2)^2 \u2013 16000 = 7040<\/li>\n\n\n\n<li>SI on Rs. 12,000 for 2 years: 12000 \u00d7 30 \u00d7 2 \/ 100 = 7200<\/li>\n\n\n\n<li>Difference = 7200 \u2013 7040 = 160<\/li>\n<\/ul>\n\n\n\n<p><strong>Answer:<\/strong> Rs. 160<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-16018d1d wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.oliveboard.in\/sbi-po-practice-paper-1\/?ref=conttm-sbi-si\" target=\"_blank\" rel=\"noreferrer noopener\">download SBI PO Practice paper<\/a><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Quick_Tips_and_Tricks_for_SBI_PO_SICI\"><\/span>Quick Tips and Tricks for SBI PO SI\/CI<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Mastering Simple and Compound Interest is not just about knowing formulas\u2014it\u2019s also about <strong>using shortcuts, avoiding calculation mistakes, and solving questions quickly under exam conditions<\/strong>. The following tips will help you maximize accuracy while saving time in both Prelims and Mains exams.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Use CI-SI shortcuts:<\/strong> For 2\u20133 year differences between compound and simple interest, apply the shortcut formulas to save time instead of calculating year by year.<\/li>\n\n\n\n<li><strong>Approximate large numbers mentally:<\/strong> Quickly estimate results to eliminate unlikely options, then refine your calculation for accuracy.<\/li>\n\n\n\n<li><strong>Year-by-year CI calculations for small T:<\/strong> When the period is 2\u20133 years, breaking the calculation into yearly interest prevents mistakes.<\/li>\n\n\n\n<li><strong>Eliminate impossible options first:<\/strong> If multiple-choice options are widely different, ruling out unlikely answers can reduce calculation time.<\/li>\n\n\n\n<li><strong>Combine SI and CI carefully in mixed problems:<\/strong> When a question involves both simple and compound interest, calculate each separately, then combine carefully to avoid errors.<\/li>\n\n\n\n<li><strong>Practice regularly:<\/strong> Solve 15\u201320 questions daily from past SBI PO papers or mock tests to internalize patterns and improve speed.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<ul class=\"wp-block-latest-posts__list is-grid columns-3 wp-block-latest-posts\"><li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/www.oliveboard.in\/blog\/coding-decoding-new-pattern-reasoning-video\/\">[Video] How to solve Coding &amp; Decoding Questions IBPS, RBI, SSC CGL, SBI Exams<\/a><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/www.oliveboard.in\/blog\/important-simplification-questions\/\">Simplification Questions for Bank PO Exams, FREE PDF &amp; Live Quiz<\/a><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/www.oliveboard.in\/blog\/geometry\/\">Geometry Question Types, Formulas, Concepts, Short Tricks<\/a><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/www.oliveboard.in\/blog\/sbi-po-eligibility-check-tool\/\">Are You Eligible for SBI PO 2026? Check Eligibility with FREE Live Tool<\/a><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/www.oliveboard.in\/blog\/sbi-po-mains-expected-questions\/\">SBI PO Mains Expected Questions 2026 Section-Wise Analysis<\/a><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/www.oliveboard.in\/blog\/sbi-po-preparation-kit-pdf\/\">SBI PO 2026 Preparation Kit: Topic-Wise Practice Guide<\/a><\/li>\n<\/ul>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n","protected":false},"excerpt":{"rendered":"<p>Interest problems are a highly scoring topic in SBI PO exams. Simple and Compound Interest questions often appear in both<\/p>\n","protected":false},"author":60,"featured_media":240189,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,31,33],"tags":[5493,6238,5321,6239,575,5346,6115,6117,6113,6116,5325,6114,6119,6089,111,5350,6105,6120],"class_list":["post-17467","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles","category-bank-exams","category-sbi-po","tag-banking-current-affairs-2018","tag-banking-current-affairs-pdf","tag-current-affairs-2018","tag-current-affairs-for-bank-exams-month-wise","tag-sbi","tag-sbi-2018","tag-sbi-2018-english-language","tag-sbi-2018-essay-writing","tag-sbi-2018-exam-preparation","tag-sbi-2018-reasoning-ability","tag-sbi-clerk-2018","tag-sbi-english-language","tag-sbi-essay-writing","tag-sbi-general-awareness","tag-sbi-po","tag-sbi-po-2018","tag-sbi-po-2018-descriptive-test","tag-sbi-po-2018-ebook","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.6 (Yoast SEO v26.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Master SBI PO Simple &amp; Compound Interest with Tricks &amp; Tips<\/title>\n<meta name=\"description\" content=\"Learn how to solve SBI PO Simple and Compound Interest problems easily with formulas, step-by-step methods, sample questions, and quick exam tips.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.oliveboard.in\/blog\/sbi-po-how-to-approach-sbi-po-simple-interest-problems\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Master SBI PO Simple &amp; Compound Interest with Tricks &amp; Tips\" \/>\n<meta property=\"og:description\" content=\"Interest problems are a highly scoring topic in SBI PO exams. 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