A) \[5\]
B) \[4\]
C) \[8\]
D) \[6\frac{1}{4}\]
Correct Answer: C
Solution :
[c] Let the amount is Rs. x and rate of SI is r%. Then, number of years \[=\frac{r}{2}\] \[\therefore \] \[\frac{8}{25}\times x=\frac{x\times r\times \frac{r}{2}}{100}\]\[\Rightarrow \]\[8=\frac{{{r}^{2}}}{2\times 4}\] \[\therefore \] \[r=\sqrt{16\times 4}=4\times 2=8%\] |
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