If the rate of simple interest in percent per annum of a monetary fund be `8%` for the first two years, `8%` for the next three years and `10%` for the last years, then find the principal, the interest of which in `6` years is `Rs1520`.

At what rate of simple interest in percent per annum, the ratio of principal and its interest after 20 years is 1:1 ?

The rate of simple interest in percent per annum of a monetary fund is 5% . If the interest obtained is added to the principal at a regular interval of 10 years, then in how many years Rs1000 will amount to Rs2000 ?

Find the rate of simple interest in percent per annum if the simple interest of a principal is 3/5 part of the amount in 10 years.

At the same rate of simple interest in percent per annum, if a principal becomes the amount of Rs 1248 in 7 years and or Rs 1056 in 4 years. Find the principal and rate of simple interest in percent per annum.

If the rate of compound interest for the first year be 3%, for the second year be 2% and for the third year be 1% then find the sum of the money, the amount of which of 3 years is Rs. 15916.59.

In a certain bank, the rate of simple interest in percent per annum during first 2 years is 3% , 6% during the next 3 years and 9% during the rest of the years. If a person deposits some money to that bank, he gets an interest of Rs2760 after 10 years. Find the principal of the person.

At the rate of 10% compound interest per annum fird the principal of which the compound interest in 3 years is ₹ 2979.

At the same rate of simple interest in percent per annum, if a principal becomes the amount of 7100Rs in 7 years and of 6200Rs in 4 years. Determine the principal and rate of simple interest in percent per annum.

At the same rat of simple interest in present per annum, if a principle becosmes the amount of ₹ 7400 in 8 years and of ₹ 6200 in 4 years, then determine the principal and rate of simple intest in percent per annum.

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.