Q. If a sum of money at simple interest doubles in 6 years, it will become 5 times in
A
12 years
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B
18 years
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C
24 years
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D
30 years
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E
36 years
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Solution
The correct option is C 24 years Principal amount = x, SI = x, for y rate of interest x=x×y100×6 y=503% For principal amount x, SI = 4x and rate = 503% 4x=x×503×1100×t t = 4 × 6 = 24 years