A) one year
B) two years
C) three years
D) four years
Correct Answer: B
Solution :
Given Sum \[\text{(P)=}Rs.\text{ }1000,\]Rate \[=10%,\] C.I. \[=Rs.\text{ }210,\]Time \[(n)=?\] Now \[C.I.=P\left[ {{\left( 1+\frac{r}{100} \right)}^{n}}-1 \right]\] \[\therefore \] \[210=1000\left[ {{\left( 1+\frac{10}{100} \right)}^{n}}-1 \right]\] or \[{{\left( \frac{11}{10} \right)}^{n}}-1=\frac{210}{1000}=0.21\] or \[{{\left( \frac{11}{10} \right)}^{n}}=1.21=\frac{121}{100}={{\left( \frac{11}{10} \right)}^{2}}\] \[\therefore \] \[n=2\] years
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