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8th Class Mathematics Related to Competitive Exam Question Bank Arithmetic

  • question_answer
    A publisher sells books to a retail dealer at Rs.5 a copy but allows 25 copies to count as 24. If the retailer sells each of the 25 copies Rs.6, his profit per cent is                      

    A) 20%                                  

    B) 25%             

    C) 24%                                  

    D) 40%                  

    Correct Answer: B

    Solution :

    The cost of 25 copies to the retailer\[\frac{a}{b}=\left( \frac{a}{b}\times 100 \right)%\] The SP of 25 copies \[\text{Percentage increase=}\left( \frac{\text{Increase in quantity}}{\text{Original quantity}}\text{ }\!\!\times\!\!\text{ 100} \right)\text{ }\!\!%\!\!\text{ }\] Profit\[=\frac{150-120}{120}\times 100=25%\]      


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