Deepa deposited ₹10,000 in a bank on simple interest. After 4 years, she received an amount of ₹12,400. Find the rate of interest.

A music teacher borrowed ₹8,200 from a friend at 6.5% simple interest per annum. After 3 years, he repaid the amount along with a small donation of ₹280 to his friend's charity. Find the total amount he paid.

What sum (in ₹) will earn a simple interest of ₹840 in 3 years at 20% per year rate of interest?

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).

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.​