A certain sum is invested at a simple interest rate of 12% per annum for a certain period of time. If the sum becomes four times the principal at the end of the period, what is the duration of the investment?

Simple interest of ₹375 is obtained on a sum of money for a period of 3 years at a rate of 2% per annum. Find the sum (in ₹).

A sum amounts to ₹ 9075 in $$1\frac{1}{3}$$​ years at 15% p.a, interest compounded 8-monthly. What is the simple interest (in ₹) on the same sum for the same period and at the same rate of interest ?

In how much time will a sum of money ₹7500 earn an interest of ₹150 at the rate of 4% per annum simple interest?

The simple interest on a certain sum for $$4\frac{2}{9}$$​ years at the rate of 4.5% per annum is ₹8,778. What will be the amount payable on the same sum at the rate of 5.5% per annum simple interest in $$2\frac{5}{7}$$​ years?

The simple interest on a principal amount is Rs. 714 for a period of 3 years at the rate of 7% per annum.

Amit invests a sum of Rs. 5400 and Gopal invests a sum of Rs. 10200 at the same rate of simple interest per annum. If, at the end of 4 years, Gopal gets Rs. 960 more interest than Amit, then find the rate of interest per annum (in percentage).

A certain sum invested at simple interest amounts to Rs. 8,411 in 3$$\frac 12$$​ years and to Rs. 9,776 in 6 years at thesame rate of interest per annum. What is the rate of interest per annum?

Gopal invests a sum of Rs. 5400 and Akshay invests a sum of Rs. 9400 at the same rate of simple interest per annum. If, at the end of 6 years, Akshay gets Rs. 720 more interest than Gopal, then find the rate of interest per annum (in percentage).

Akshay invests a sum of Rs. 5400 and Atul invests a sum of Rs. 9400 at the same rate of simple interest per annum. If, at the end of 6 years, Atul gets Rs. 360 more interest than Akshay, then find the rate of interest per annum (in percentage).

Find the simple interest (in Rs.) on Rs. 1,200 at an interest rate of 3% per month in 6 months.​