At a rate of simple interest `7(1)/(2)%` per annum, find the total amount of a principal of `Rs600` in `219` days.

Ghanshyambabu deposited his savings equally in two banks, one with a rate of simple interest of 14(1)/(2)% per annum and the other at a rate of simple interest of 15% per annum. If the difference of the interests obtained by him from two banks be rs. Rs4720 , then find the principals he has deposited in each bank.

At the rate of compound interest 5% per annum, find the amount of Rs. 80000 in 2 1/2 years.

To repay a loan of Rs6450 at a rate of simple interest of 5% per annum in 4 years, find the amount of each instalment.

A person borrowed Rs 10000 from four men. If he had to repay the first man for his Rs 2000 at the rate of simple interest of 8% per annum, the second man for his Rs 4000 at the rate of simple interest of 7(1)/(2)% per annum and the third man for his Rs 1400 at a rate of simple interest of 8(1)/(2)% per annum, then in what rate of simple interest in percent per annum, the fourth man should be paid for his rest part of principal so as to the average rate of simple interest be 8.13% per annum?

At what rate of simple interest per annum in percent the interest of a principal in 20 years will be (4)/(9) part of its amount ?

At what rate of simple interest per annum in percent, the ratio of a principal and its amount will be 50 : 59 after 3 years?

What is the rate of simple interest in percent per annum if the total interest of Rs 73,000 for 1 day is 50 paisa?

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

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.

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