Question
If a sum of money at simple interest double in 6 years. It will become 4 times in
Answer: Option D
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Let sum = `x` . Then , S.I. = `x`
`:.` Rate =`((100 xx x)/(x xx 6))`% = `50/3`%
Now , sum = `x` , S.I. = `3x` , Rate = `50/3`%
`:.` Time = `((100 xx 3x)/(x xx 50/3))` = 18 years.
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