If rupee one produces rupees nine over a period of 40 years, find the rate of s

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If rupee one produces rupees nine over a period of 40 years, find the rate of simple interest?

Options:

A . 20 %

B . 10 %

C . 15 %

D . 22 1/2%

Answer: Option D

9 = (1*40*R)/100

R
= 22 1/2 %

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