The task is to generate the correct answer for a given math problem.

Ex Input:
Problem: by selling an article for $ 225 a person gains $ 75 . what is the gain % ?

Ex Output:
50 %


Ex Input:
Problem: 300 first - time customers of a fashion store were surveyed for their shopping experience right after leaving the store . 60 % of the customers in the survey had purchased clothes for less than $ 100 . 40 % of the customers in the survey reported they were overall satisfied with their purchase . 45 % of the customers that had purchased clothes for less than $ 100 reported they were overall satisfied with their purchase . what percent of the customers surveyed purchased clothes for at least $ 100 and reported that they were not overall satisfied with their purchase ?

Ex Output:
13


Ex Input:
Problem: find the cost of fencing around a circular field of diameter 22 m at the rate of rs . 2.50 a meter ?

Ex Output:

172