A) Rs. 72
B) Rs. 80
C) Rs. 90
D) Rs. 100
Correct Answer: B
Solution :
Let the cost price by Rs. x. \[\therefore \]\[(100+x)%\text{ of }x=144\] \[\Rightarrow \]\[(100+x)x=14400\] \[\Rightarrow \]\[{{x}^{2}}+100x-14400=0\] \[\Rightarrow \] \[{{x}^{2}}+180x-80x-14400=0\] \[\Rightarrow \] \[x\,\,(x+180)-80\,\,(x+180)=0\] \[\Rightarrow \] \[(x+180)\,\,(x-80)=0\]\[\Rightarrow \]\[x=80\]You need to login to perform this action.
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