Bunuel wrote:
If a taxi driver charges x cents for the first quarter-mile of a trip and (x/5) cents for each additional quarter-mile, what is the charge, in cents, for a trip whose distance in miles is the whole number y?
A. (x+xy)/125
B. (4x + 4xy)/5
C. (4x+xy)/500
D. (4x+xy)/5
E. xy/25
Since 1 mile has 4 quarter-miles, a trip of y miles has 4y quarter-miles, and after the first quarter-mile that charges x cents, there are 4y - 1 additional quarter-miles that charge x/5 cents each. Thus, the total
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