Simple Interest - Questions and Answers

6. The simple interest on a sum of money is of the principal and the number of years is equal to the rate per cent per annum. The rate percent per annum is:

7. In how many years will a sum of money double itself at 12% per annum:

8. A sun of money, put at simple interest trebles itself in 15 years. The rate percent per annum is:

9. A certain sum of money at simple interest amounts of Rs. 1260 in 2 years and to Rs. 1350 in 5 years. The rate percent per annum is:

10. At simple interest, a sum doubles after 20 years. The rate of interest per annum is :