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8th Class Mathematics Related to Competitive Exam Question Bank Arithmetic

  • question_answer
    If the discount is 10%, an item bought for Rs.9 is priced at

    A) Rs.11                    

    B) Rs.10                

    C) Rs.8.10                 

    D) Rs.12

    Correct Answer: B

    Solution :

    Let MP be Rs.\[x.\] Then, \[\left\{ \frac{x}{(100+x)}\times 100 \right\}%\] But  \[\left\{ \frac{x}{(100-x)}\times 100 \right\}%\] So, \[\frac{90x}{100}=9\] \[=\left\{ \left( \frac{r}{r-100} \right)\times 100 \right\}%\]      


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