A certain sum of money amout to `rs 10080` in 5 years at `8%` find principle

A sum of money amounts to Rs. 1500 in 5 years at 10% per annum at simple interest. Find the sum.

A certain sum amounts to Rs 72900 in 2 years at 8% per annum compound interest, compounded annually. Find the sum.

A sum of money amounts to Rs. 3200 in 4 years and Rs. 8000 in 8 years on compound interest. Find the sum.

A certain sum amounts to Rs 5832 in 2 years at 8% compounded interest. Find the sum.

The difference between compound interest and simple interest on a certain sum of money for 3 years at 5% per annum is Rs. 122. Find the principal.