At what rate % per annum will be interest on Rs.550 be Rs. 66 in 3 years.

At what rate percent per annum simple interest will a sum of money triple itself in 25 years

Interest on Rs. 100 for 1 year is called. 

The S.I on a certain sum for 3 years at 14% per annum is rs. 235.20.  The sum is 

A sum of amounts to Rs. 1352 in 2 years at 4% compound interest. The sum is

At what rate percent  compound interest will Rs.625 amount to Rs. 900 in 2 years?

The difference between the simple interest for 6 years at 6% per annum and for 4 years at 4% per annum on R.S _____ is Rs. 500

Mohan borrowed Rs. 16,000 for 3 at 5% per annum compound interest.  Then the amount that Mohan will pay at the end of 3 years?

At what rate percent compound interest will  Rs. 625 amount to Rs.900 in 2 years 

At what rate percent per annum simple interest will a sum double itself in 8 years 4 months.