Question
Amit invested a sum at a certain rate of interest on
simple interest and he got 90% more amount after 4 years. If he invests Rs. 7200 at the same rate of interest on SI, then find the total interest he would get after 5 years?Solution
Let sum invested by Amit = 100x And amount he got = 190% of 100x = 190x Let rate of interest be ‘r’ % p.a. According to the question – (100x × r × 4)/100 = 190x – 100x R = 22.5%   Required interest = Rs. (7200 × 22.5 × 5)/100 = Rs 8100
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