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

Input: Consider Input: Problem: a sum of money at simple interest amounts to rs . 815 in 3 years and to rs . 878 in 4 years . the sum is :

Output: 626


Input: Consider Input: Problem: a dealer purchases 15 articles for rs . 25 and sells 12 articles for rs . 32 . find the profit percentage ?

Output: 60 


Input: Consider Input: Problem: calculate the circumference of a circular field whose radius is 7 centimeters .


Output: 14 π c