In town A, the number of people who use private transport is 1740 which is 480 more than the number of people who use public transport.
Thus, number of people who use public transport from town A = 1740 - 480 = 1260
The ratio of number of people who use public transport from town A to that who use public transport from town C is 7: 8.
Thus, number of people who use public transport from town C = 1260 * 8/7 = 1440
The number of people who use private transport from town B is 1940.
The number of people who use public transport from town B = 800 + 1260 = 2060
The number of people who use private transport from town C = 3200 - 1440 = 1760
Tabulating the above data:
| Town A | Town B | Town C |
| Public transport | 1260 | 2060 | 1440 |
| Private transport | 1740 | 1940 | 1760 |
Required % = (2060 - 1760)/1760 * 100 = 17.04% ≈ 17%
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