Question

An amount doubles itself in 15 years. what is the rate of interest ?
A) 7.85 %
B) 9.41%
C) 6.66 %
D) 4.21 %

Answer 1

An amount doubles itself in 15 years. what is the rate of interest ?
A) 7.85 %
B) 9.41%☑️☑️☑️
C) 6.66 %
D) 4.21 %

Answer 2

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Here is your answer
Let the Sum is P
SI = P
T = 15 years
Let R = r%

As we know that
SI = PRT/100
$p = \frac{p \times r \times 15}{100} \\ r = \frac{100}{15} \\ r = 6.66\%$
So The rate of interest is 6.66%

Option (C) 6.66% is your answer

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