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.

What is the interest for 16,000 rupees at 12 1/2 % for one year? What would be the interest if the rate of interest is only 6 1/4 % ?

What is the interest for 5000 rupees at 10 % for 2 years?

What is the interest on ₹ 100 at 9 p.c.p.a. for 1 year ?

What is the interest on ₹ 1,000 at 10 p.c.p.a. for 1 year ?

What is the interest for 2000 rupees at 8 % for 4 years?

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

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 ?