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A certain sum becomes four times itself at simple interest in eight years. In how many years does it become ten times itself? |
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Answer» None of these Let the sum be Rs. x, then it becomes Rs. 4x in eight years Rs. 3X is the interest on x for eight years. R = (100 * 3x)/(x * 8) = 300/8 % If the sum becomes ten times itself, then interest is 9x. The required time PERIOD = (100 * 9x)/(x * 300/8) = (100 * 9x * 8)/(x * 300) = 24 years. |
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