Question

A certain money was invested which amounted to Rs 9000 at 4% per annum simple interest in 3 years . what will it amount in 6 years at 10% per annum simple interest ?

Answer 1

Answer:

Rs.5500/-.

assume X as the amount invested at 4%, hence 9000-X is the amount invested at 7%.

Now total SIMPLE INTEREST for 5 years was 5325/-, so for 1 year, it was 465/-.

Now the interest earned on amount X at 4% would be 4X/100, and interest on Amount (9000-X) at 7% would be (9000-X)*7/100, and the TOTAL interest of the above two should be 465/-. Thus 4X/100 + (9000-X)*7/100 =465, solving for X, X=5500.