Compound interest (adjusted annually) and simple interest on an amount of Rs 1000 for 2 years

The difference between compound interest (compounded annually) and simple interest on a sum of Rs. 1000 at a certain rate of interest for 2 years is Rs. 10. The rate of interest per annum is:

The difference berween the compount interest, compounded annually and the simple interest on a certain sum for 2 years at 15% per annum is Rs 180. Find the sum.

The difference between the compound interest (compounded annually) and simple interest, for two years on the same sum at the amount rate of interest is Rs 370. Find the rate of interest if the simple interest on the amount at the same rate of interest for 1 year is Rs 3700.

Find the difference between the amount of compound interest and simple interest on a principal amount of Rs 8,000/- at an annual interest rate of 10% after 2 years.