Question
A certain sum gives the interest equals to
3/5th of the sum when invested for 5 years at simple interest. Find the rate of simple interest.Solution
Let the sum invested be Rs. x and the rate of the interest be r% p.a. According to the question, (x × 5 × r)/100 = 3x/5 Or, r = 12%
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 Quan...
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5, 9, 17, 33, ?, 129