Rupees 10,000 is invested at 6% interest compounded annually. How long will it take to accumulate Rs. 20, 000 in the account?

A sum of Rs. 10,000 is invested at 8% p.a. compound interest? How long will it take for the total sum of money to be twice the amount invested?

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.10,000 is invested at 5% interest rate p.a. Find the interest at the end of one year.

A sum of Rs.20,000 is invested by Heena for 2 years at an interest of 8% comopunded annually.Find the compound interest and the amound she has to pay at the end of 2 years.