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

Ex Input:
Problem: find compound interest on $ 10000 at 15 % per annum for 2 years 4 months , compounded annually .

Ex Output:
3886.25

Ex Input:
Problem: amit and ananthu can do a work in 10 days and 20 days respectively . amit started the work and left after 2 days . ananthu took over and completed the work . in how many days was the total work completed ?

Ex Output:
18 days

Ex Input:
Problem: a and b can do a piece of work in 10 days and 10 days respectively . they work together for 10 days and b leaves . in how many days the whole work is completed ?

Ex Output:
30 days