Task: Question Answering
Input (English): Problem: a certain car uses one gallon of gasoline every 38 miles when it travels on highway , and one gallon of gasoline every 20 miles when it travels in the city . when a car travels 4 miles on highway and 4 additional miles in the city , it uses what percent more gasoline than if it travels 8 miles on the highway ? 
Options: a ) 15 % , b ) 20 % , c ) 22.5 % , d ) 45 % , e ) 50 %
Output (English): d