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    Question

    Mina sold 25 lamps at a profit of 20%. If she had sold

    all the lamps for Rs. 2500 more, her overall profit would have been 40%. What is the selling price of 18 lamps at 30% profit?
    A Rs. 11700 Correct Answer Incorrect Answer
    B Rs. 12420 Correct Answer Incorrect Answer
    C Rs. 13000 Correct Answer Incorrect Answer
    D Rs. 14000 Correct Answer Incorrect Answer
    E Rs. 15000 Correct Answer Incorrect Answer

    Solution

      Let the cost price of each lamp be Rs. z.   Initial selling price of all lamps = 1.2 × 25 × z = Rs. 30z   According to the question, 30z + 2500 = 1.4 × 25z Or, 35z - 30z = 2500 Or, 5z = 2500 Or, z = 500 Therefore, the selling price of 18 lamps at 30% profit = 18 × 1.3z = Rs. 11700

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