The total production of coffee (in lakh tons)
by company A over the period of four years = 60 + 90+
140 + 220=510
The total production of coffee (in lakh tons
by company B over the period of four years = 70+ 100 +
150 +210=530
The total production of coffee (in lakh tons)
by company C over the period of four years = 50+ 190 +
180 +250=670
The total production of coffee (in lakh tons)
by company D over the period of four years1 120 + 170
+ 200+260=750
Now,
The combined average production for four years of
companies A and C is:
=(510 + 670)/8 =147.5
The combined average production for four years of companies B and D is;
= (530 + 750)/8=160
Percentage difference =((Combined average of A and C - Combined average of B and D) / Combined average of B and D) *100
= (147.8-160)/160
=-7.72 %
Hence, The combined average production for four years
of companies A and C is 7.72% (approximately 7.8%) percentage less than the combined average production for four years of companies B and D.
So option (a) is the correct answer.
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