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?  Choose the most appropriate option.
A) (x+xy)/125  B) (4x + 4xy)/5  C) (4x+xy)/500  D) (4x+xy)/5  E) xy/25
let Y be 1 mile   x= 20 cents   as per given info   in 1 mile we have 4 quarter mile   so for the first mile x=20 cents and x/5 cents =20/5= 
<gadget id="calculator">20/5</gadget>
<output>4</output>
4 cents for every additional quarter mile   so total=20+4+4+4= 
<gadget id="calculator">20+4+4+4</gadget>
<output>32</output>
32 cents charge for complete ride.   we just substitute our values in the given options and we get our ans (4x + 4xy)/5.
<result>B</result>
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?