A weaver Cooperative society takes a loan of ₹15,000 at the time of buying a power loom. After 5 yrs. the society has to repay ₹22125 for recovering the loan. Let us determine the rate of simple interest in percent per annum.

At the same rate of simple interest in percent per annum, if a principal becomes the amount of ₹7100 in 7 yrs. and of ₹6200 in 4 yrs., let us determine the principal and rate of simple interest in percent per annum.

Amal Roy deposits ₹2000 in the bank and Poshupoti Ghosh deposits ₹2000 in the post office at the same time. After 3 yrs. they get the return amounts ₹2360 and ₹2480 respectively. Let us write by calculating, the ratio of the rate of simple interest in percent per annum in the bank and that of in the post office.

Aslamchacha got ₹1,00,00 when he retired from his service. He deposited some of that money in the bank and rest of his money in the post office and got ₹5400 in total per year as interest. If the rates of simple interest per annum in the and in the post office are 5% and 6%, respectively, then us write by calculating, the money he had deposited in the bank and post office.

Rekhadidi deposited ₹10,000 of her savings in two separate banks at the same time. The rate of simple interest per annum is of 6% in one bank and that of 7% in other bank; after 2 yrs., if she gets ₹1280 in total as interest, then let us writhe by calculating, the money she had deposited separately in each of two banks.