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    Question

    A shopkeeper marks his goods 40% above the cost price.

    He allows a discount of x% on the marked price, but while selling he uses a weight of 800 g instead of 1 kg and still makes an overall profit of 40%. Find the value of x.
    A 20 Correct Answer Incorrect Answer
    B 12 Correct Answer Incorrect Answer
    C 18 Correct Answer Incorrect Answer
    D 30 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Let cost price of 1 kg = Rs. 100. Then marked price (MP) of 1 kg = 100 ├Ч 1.40 = Rs. 140. He actually gives 800 g but charges for 1 kg (after discount). Selling price (SP) for 800 g = MP ├Ч (1 тИТ x/100) = 140 ├Ч (1 тИТ x/100). Cost price of 800 g = 100 ├Ч 0.8 = Rs. 80. Given overall profit = 40%: Profit% = [(SP тИТ CP) / CP] ├Ч 100 = 40 тЗТ (140(1 тИТ x/100) тИТ 80) / 80 = 0.40 тЗТ 140(1 тИТ x/100) тИТ 80 = 32 тЗТ 140(1 тИТ x/100) = 112 тЗТ 1 тИТ x/100 = 112/140 = 0.8 тЗТ x/100 = 0.2 тЗТ x = 20.

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