A) 20%
B) 10%
C) 30%
D) 8%
Correct Answer: B
Solution :
Ans. From the formula, \[A=P{{\left( 1+\frac{r}{100} \right)}^{n}}\], we have \[48400=40000\,{{\left( 1+\frac{r}{100} \right)}^{2}}\] \[\Rightarrow \] \[\frac{484}{400}=\,{{\left( 1+\frac{r}{100} \right)}^{2}}\Rightarrow \,\,{{\left( 1+\frac{r}{100} \right)}^{2}}={{\left( \frac{22}{20} \right)}^{2}}\] \[\Rightarrow \] \[1+\frac{r}{100}=\frac{22}{20}\,\Rightarrow \,1+\frac{r}{100}=\frac{11}{10}\] \[\Rightarrow \] \[\frac{r}{100}=\frac{1}{10}\] \[\therefore \] \[r=10%\]
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