Problems on Simple Interest with Solutions for Competitive Exams

Ramesh deposited ₹ 15600 in a fixed deposit at the rate of 10 % per annum simple interest. After every second year, he adds his interest earnings to the principal. The interest at the end of fourth year is 

A person lends 40 % of his sum of money at 15 % per annum, 50 % of rest at 10 % per annum and the rest at 18 % per annum rate of interest. What would be the annual rate of interest, if the interest is calculated on the whole sum? 

A man borrows some amount at the rate of 12% per annum at simple interest. After 6 years 8 months, he paid 720 as an interest. Find the amount borrowed by him. 

A person borrows some money for 5 years and the ratio of the loan amount: total interest amount is 5 : 2. Then find the ratio of the loan amount: interest rate is equal to 

A person borrows 5,000 for 2 years at 4 % per annum simple interest. He immediately lends it to another person at $$6{1\over 4}\%  $$ per annum simple interest for 2 years. His gain in this transaction is