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If you are talking money and interest, then if the interest is simple interest then

5000 = 50 x N x 0.05, hence N = 5000/25 = 200 years

If the interest is compounded then 50x(1.05)^N = 5000

Hence (1,05)^N = 100

N x log(1.05) = log(100) ...........(log is to base 10)

N = 100/log(1.05)

N = 2/0.02118

N = 94.42 years approximately

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12y ago

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