A) 50 years
B) 25 years
C) 12 years
D) 40 years
Correct Answer: D
Solution :
(d): Let time period be 't' years. \[A=P\left( 1+\frac{rt}{100} \right)\] \[\frac{A}{P}=5=\left( 1+\frac{rt}{100} \right)\] \[5=\left( 1+\frac{10\times t}{100} \right)\] \[\Rightarrow 4\times \frac{100}{10}=t\] \[\Rightarrow t=40\]You need to login to perform this action.
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