Let us write by calculating, the number of yrs for which an amount becomes twice of its principal having the rate of simple interest of 6% per annum.

Sovadebi deposited some amount of money in a bank at the rate of simple interest of 5.25% per annum. After 2yrs. She has got ₹840 as interest. Let us write by calculating, the money she has deposited in the bank.

Goutam took a loan of some money from a Cooperative bank for opening a poultry farm atthe rate of simple interest of 12% per annum. Every month he has to repay ₹378 as interest. Let us determine the loan amount taken by him.

Mannan Miyan observed, after 6 years of taking a loan of some money, that the interest to be paid had become th of its principal. Let us determine the rate of simple interest in percent per annum.

An agricultural Co-operative society gives agricultural loan to its members at the rate of simple interest of 4% per annum. But an interest is to be given at the rate of simple interest of 7.4% per annum for a loan taken from the bank. If a farmer being a member of the Co-operative society takes a loan of ₹5000 from it instead of taking loan from the bank, the let us write, by calculating the money to be saved as interest per annum.