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

Problem: find the sum the difference between the compound and s . i . on a certain sum of money for 5 years at 20 % per annum is rs . 75 of money ?
1875

Problem: the average of first six prime numbers greater than 20 is ?
3

Problem: a cycle is bought for rs . 1120 and sold for rs . 1200 , find the gain percent ?
7 %