The normal gasoline mileage of a car is 48 mpg. On a smooth road, the cars mileage is 12% higher. What is its mileage on a smooth road? Round your answer to the tenths place.

A 12% increase means adding 12% of 48 mpg to the normal mileage. Since 0.12 × 48 = 5.76, the smooth-road mileage is 48 + 5.76 = 53.76 mpg, which rounds to 53.8 mpg. The correct choice is 53.8 mpg.

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