A certain car uses one gallon of gasoline every 30 miles when it travels on the highway, and one gallon of gasoline every 20 miles when it travels in the city. When a car travels 4 miles on the highway and 4 additional miles in the city, it uses what percent more gasoline than if it travels 8 miles on the highway?
A. 15%
B. 20%
C. 22.5%
D. 25%
E. 50%
The OA is D
Source: Economist GMAT
A. 15%
B. 20%
C. 22.5%
D. 25%
E. 50%
The OA is D
Source: Economist GMAT
