A) 10 years
B) 15 years
C) 20 years
D) 25 years
Correct Answer: C
Solution :
On the rate 10%, the amount becomes thrice. So, principle is p, then amount is 3p. \[\therefore \] Interest = amount-principle \[=3p-p=2p\] \[\therefore \] Interest \[=\frac{Principle\text{ }\times \text{ }time\text{ }\times \text{ }rate}{100}\] \[2P=\frac{P\times time\times 10}{100}\] \[\therefore \] time \[=\frac{2P\times 100}{10p}=20\]years.
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