Question

at what rate percent will a sum of money double itself in 5 years

Answer 1

Ans : 5%

$let \: sum = x \\ then \: simple \: interest \: for \: 20 \: years \: = x \\ r = \frac{100 \times \: si}{pt} = \frac{100 \times x}{x = 20} = 5$

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