What equal installment of annual payment will discharge a debt which is due as ₹ 848 at the end of 4 years at 4 % per annum simple interest? 

Rs. 1,080 invested for 3 months gave an interest of Rs. 27. The simple rate of interest per annum was :

The difference between simple interest and compound on Rs. 1200 for one year at 10% per annum reckoned half-yearly is:

A sum of money lent out at simple interest amounts to ₹720 after 2 years and 1020 after a further period of 5 years. Find the principal. 

If the simple interest on a certain sum of money for 2 years in one fifth of the Principal, then find rate of interest per annum. 

A person invested some amount at the rate of 12 % simple interest and a certain amount at the rate of 10 % simple interest for 1 year. He received yearly interest of Rs. ₹ 130, but if he had interchanged the amount invested, he would have received 4 more as interest. How much did he invest at 12 % simple interest? 

At what simple rate of interest a sum is double in 8 years?

A certain sum doubles in 7 years at simple interest. The same sum under the same interest rate will become 4 times in how many years.: