A certain amount of money, when invested at a simple interest rate of 'r%' per annum, grows to 6 times its original value in 24 years. Determine the value of 'r'.
According to the given conditions, Let the initial investment be Rs. p. The interest earned in 24 years = (6p – p) = Rs. 5p. Therefore, using the formula for simple interest = (p×r×24)/100=5p Solving for 'r': r = (5p×100)/(p×24) = 20 Hence, the value of 'r' = 20.
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