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8th Class Mathematics Related to Competitive Exam Question Bank Arithmetic

  • question_answer
    A man sold a watch for Rs.60 and lost something. Had he sold it for Rs.75, his gain would have been double the former loss. Find the cost price of the watch.

    A) 60                                     

    B) 62

    C) 64                                     

    D) 65

    Correct Answer: D

    Solution :

    Let loss = Rs. x S.P. = Rs.60 \[=\frac{R}{2}%\] If S.P. is Rs.75, then gain = 2x So, S.P. = C.P. + gain \[A=P{{\left( 1+\frac{R}{2\times 100} \right)}^{2n}}\] \[=\frac{R}{4}%\] \[A=P{{\left( 1+\frac{R}{4\times 100} \right)}^{4n}}\] So, \[C.P.=60+5=65.\]


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