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Mathematics 17 Online
OpenStudy (anonymous):

From 1980 to 1990, the consumer price index (CPI) increased from 82.4 to 130.7. If a bottle of dish soap cost $0.74 in 1980 and the price of dish soap increased at the same rate as the CPI from 1980 to 1990, by approximately how much did the price of a bottle of dish soap increase from 1980 to 1990?

OpenStudy (ranga):

This is a proportions problem. 130.7 / 82.4 = x / 0.74 where x is the price of dish soap in 1990 Solve for x. Subtract $0.74 from x to find out how much the price increased by.

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