The way to get this answer is to calculate the n value (number of weeks) multiplied by 3.50 plus the original value of 88 dollars
(3.50n)+88 =200
so first you subtract 88 from 200
3.50 x n= 112
then divide 3.50 by 112 to receive the value of n
n=112/3.5
n=32
so the answer is 32 weeks aka B