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SSC Sample Paper Mock Test-7 SSC CGL Tear-II Paper-1

  • question_answer
    A clock was sold for Rs. 144. If the percentage of profit was numerically equal to the cost price, the cost of the clock was

    A)  Rs. 72

    B)  Rs. 80

    C)  Rs. 90

    D)  Rs. 100

    Correct Answer: B

    Solution :

    Let the cost price by Rs. x. \[\therefore \]\[(100+x)%\text{ of }x=144\] \[\Rightarrow \]\[(100+x)x=14400\] \[\Rightarrow \]\[{{x}^{2}}+100x-14400=0\] \[\Rightarrow \] \[{{x}^{2}}+180x-80x-14400=0\] \[\Rightarrow \] \[x\,\,(x+180)-80\,\,(x+180)=0\] \[\Rightarrow \]   \[(x+180)\,\,(x-80)=0\]\[\Rightarrow \]\[x=80\]


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