The fuel efficiency of a certain make of car was increased from 30 miles per gallon for last year’s model to 45 miles

The fuel efficiency of a certain make of car was increased from 30 miles per gallon for last year’s model to 45 miles per gallon for this year’s model. By what percent was the fuel efficiency of the car increased?

A. 15%
B. 33 1/2%
C. 50%
D. 66 2/3%
E. 75%

OA C

Source: Princeton Review

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