8th Class Mathematics Percentage Question Bank Percentage, Profit and Loss

  • question_answer A vendor sells lemons at 5 for a rupee gaining 40%. How many did he buy for a rupee?

    A)  6                   

    B)  7    

    C)  8                    

    D)  10

    Correct Answer: B

    Solution :

    (b): Let C.P be 'x' per lemon S.P = 1/5 (for one lemon) \[Gain\,%=\frac{\frac{1}{5}-x}{x}\times 100%=40%\] \[\Rightarrow \frac{\frac{1}{5}-x}{x}=\frac{2}{5}\] \[\Rightarrow 1-5x=2x\] \[\Rightarrow 1=7x\Rightarrow x=\frac{1}{7}.\] \[\Rightarrow \] C.P OF 7 lemons = 1 rupees.

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