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    By selling a book at Rs.125, Ram earns a profit equal to 2/5 th of the selling price. Find the cost price of the book (in Rs.).
    Question

    By selling a book at Rs.125, Ram earns a profit equal to 2/5 th of the selling price. Find the cost price of the book (in Rs.).

    A.

    Rs.30

    B.

    Rs.75

    C.

    Rs.50

    D.

    Rs.100

    Correct option is B

    Given:

    Selling price of book = Rs 125

    Profit = 2/5 of the selling price.

    Formula Used:

    Profit = selling price – cost price

    Solution:

    Let the profit be 7 units.

    Profit = 25×Selling Price=25×125\frac{2}{5} \times \text{Selling Price} = \frac{2}{5} \times 125​ = 50 

    The cost price is the selling price minus the profit:

    Cost Price = 125 - 50 = Rs.75

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