A) 12%
B) 14%
C) 15%
D) 18%
Correct Answer: C
Solution :
Marked price = Rs. 720 |
Actual price = Rs. 550.80 |
First discount = 10% |
Let the second discount be x%. |
Then, we can write |
\[720\,\,(1-0.10)(1-0.01x)=550.80\] |
\[\Rightarrow \]\[720\times 0.9\,\,(1-001x)=550.8\] |
\[\Rightarrow \] \[648\,\,(1-0.01x)=550.8\] |
\[\Rightarrow \] \[1-0.01x=\frac{550.8}{648}\] |
\[\Rightarrow \] \[0.01x=1-\frac{550.8}{648}\] |
\[\Rightarrow \] \[x=\frac{1-0.85}{0.01}\] |
\[\Rightarrow \] \[x=0.15\times 100\] |
\[\Rightarrow \] \[x=15\] |
\[\therefore \] Second discount = 15% |
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