A sum amounts to double in 8 years by simple interest. Then the rate of simple i

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A sum amounts to double in 8 years by simple interest. Then the rate of simple interest per annum is

Options:

A . 12.5%

B . 10%

C . 20%

D . 15%

Answer: Option A
Answer: (a)Principal = Rs.xAmount = Rs.2x Interest = 2x - x = Rs.xRate = ${SI × 100}/\text"Principal × Time"$= ${x × 100}/{x × 8} = 25/2$ = 12.5 % per annumUsing Rule 3,R % = ${(n - 1)}/T × 100%$= ${(2 - 1)}/8 × 100%$ = 12.5%

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