A) 15 yr
B) 12 yr
C) 18 yr
D) 10 yr
Correct Answer: C
Solution :
Let the sum be Rs. x. Then, \[2x=x{{\left( 1+\frac{r}{100} \right)}^{6}}\]\[\Rightarrow \]\[2={{\left( 1+\frac{r}{100} \right)}^{6}}\] Cubing both sides, \[8={{\left\{ {{\left( 1+\frac{r}{100} \right)}^{6}} \right\}}^{3}}\]\[\Rightarrow \]\[8={{\left( 1+\frac{r}{100} \right)}^{18}}\] \[\Rightarrow \]\[8x=x{{\left( 1+\frac{r}{100} \right)}^{18}}\] \[\therefore \] The sum will be 8 times in 18 yrYou need to login to perform this action.
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