The interest on a certain deposit at 9% per annum is TK. 405 in one year . How much will the additional interest in one year be on the same deposit at 10 percent per annum ?

The interest on a certain deposit at 9% per annum is TK. 405 in one year . How much will the additional interest in one year be on the same deposit at 10 percent per annum ? Correct Answer None of these

We know,  I = Pnr or,  P = I / nr = 405 / (1 x 9/100) = 4500 TK. Now, interest per annum at 10% interest rate = 4500 x 1 x (10/100) =  450 TK So, additonal interest will be = 450 - 405 =  45 TK.
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