The annual interest of a principal is `(1)/(6)` parts of itself. If after `5` years the principal amounts `Rs3300`, then find the principal.

If the interest of a principal in 10 years be (2)/(5)th part of itself, then find the yearly percentage of rate of simple interest.

If the total interest of a principal in 6 years be 30% of the principal , then the total interest will be equal to the principal in

The simple interest of a principal in 1 year and 9 months at the rate of simple interest of 5% per annum is 63Rs more than of the same principal in 2 years and 4 months at the rate of simple interest of 4(1)/(2)% per annum. Find the principal.

If the compound and simple interest of a certain principal in 2 years be Rs. 40.80 and Rs. 40 respectively, then find the principal and the rate of interest in percent per annum.

A principal sum amounts to Rs 4500 in 2 years at compound interest and same sum amounts to Rs6750 in 4 years.Find the principal sum

If at the rate of simple interest in percent per annum by which a principal becomes double in 20 years and also amounts to 7Rs20 after 4 years, then find the principal.

A certain principal amounts Rs2750 in 2 years at a rate of simple interest of 5% per annum. Then find the rate of simple interest in percent per annum for which the principal amounts Rs3000 in 2 years.

With a given rate of simple interest, the ratio of principal and amount for a certain period of time is 4 : 5. After 3 years, with same rate of interest, the ratio of the principal and amount becomes 5 : 7. The rate of interest is____