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Railways Sample Paper RRB (Group D) Sample Test Paper-1

  • question_answer
    A shopkeeper earns a profit of 12% on selling a book at 10% discount on the printed price. The ratio of the cost price and the printed price of the book is

    A)  45 : 56

    B)  45 : 51

    C)  47 : 56

    D)  47 : 51

    Correct Answer: A

    Solution :

    [a] Let the CP be Rs..\[100.\] \[\therefore \]SP=Rs.\[112\] If the marked price be Rs. x, then \[90%ofx=112\] \[\Rightarrow x=\frac{112\times 100}{90}=Rs.\,\,\frac{1120}{9}\] .'. Required ratio \[=100:\frac{1120}{9}\] \[=900:1120=45:56\] Shortcut Method Marked Price = Cost price \[\times \frac{100+\Pr ofit%}{100-\,Discount%}\]  Required ratio = Cost price: Cost price\[\times \frac{112}{90}\] \[=90:112=45:56\]0


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