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

Input: Consider Input: Problem: if the cost price of 50 articles is equal to the selling price of 40 articles , then the gain or loss percent is ?

Output: 25 %


Input: Consider Input: Problem: a 10 % stock yields 8 % . the market value of the stock is :

Output: rs . 125


Input: Consider Input: Problem: in the faculty of reverse - engineering , 230 second year students study numeric methods , 423 second year students study automatic control of airborne vehicles and 134 second year students study them both . how many students are there in the faculty if the second year students are approximately 80 % of the total ?


Output: 649 .