A) 4%
B) 6%
C) 5%
D) 7%
Correct Answer: C
Solution :
Case I |
Interest \[=5x-4x\]= Rs. \[x\] |
\[\therefore \] \[x=\frac{4x\times R\times T}{100}\]\[\Rightarrow \]\[T=\frac{25}{R}\text{yr}\] |
Case II \[T=\frac{25}{R}+3=\left( \frac{25+3R}{R} \right)\,\,\text{yr}\] |
\[SI=7y-5y\]= Rs. 2y |
\[\therefore \] \[2y=\frac{5y\times R\times (25+3R)}{R\times 100}\] |
\[\Rightarrow \] \[40=25+3R\]\[\Rightarrow \]\[3R=40-25=15%\] |
\[\therefore \] \[R=\frac{15}{3}=5%\] |
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