A) Rs 11000
B) Rs 11500
C) Rs 12500
D) Rs 12800
Correct Answer: C
Solution :
Let principal = Rs 3 Then, simple interest \[=\frac{x\times 4\times 2}{100}=\frac{2x}{25}\] and compound interest \[=\left[ x\times {{\left( 1+\frac{4}{100} \right)}^{2}}-x \right]=\frac{51x}{625}\] \[\therefore \] \[\frac{51x}{625}-\frac{2x}{25}=20\] \[\therefore \] \[\frac{51x-50x}{625}=20\] \[\Rightarrow \] \[\frac{x}{625}=20\] \[\therefore \] \[x=20\times 625=\text{Rs}\,\,12500\]
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