From 1940 to 1980 the consumer price index (CPI) increased from 28.6 to 89.4. If a gallon of milk cost $0.75 in 1940 and the price of milk increased at the same rate as the CPI from 1940 to 1980, approximately how much did a gallon of milk cost in 1980?
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Write a proportion.

\[\frac{28.6}{89.4}=\frac{.75}{x}\]

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