What is interest

If a sum of ₹ 2000 is lent at 10% p.a. compound interest, what is the interest for the second year?

The compoud interest on Rs 1000 is Rs 331 for 3 years at certain rate of interest, what is the rate of interest.

At what rate of interest per annum will a sum double itself in 8 years ?

If Rs 6000 is lent at 10% per annum, interest being compounded annually, what is the interest for the 3rd year?

If Rs 12000 is invested for two years at compound interest (compounded annually ) at the rate of 20% per annum, then what is the interest ?

Rs. 1000 is being charged at 50% per annum what is the interest for 3^(rd) year at compound interest ?

What is the interest on Rs. 500 for six months with a rate of interest 8% calculated six month?

A sum of Rs 4200 becomes Rs 5082 in 3 years rate simple interest. What is the rate of interest per annum?