Maths profit and loss ?

Kindly solve 7&8 question step by step plz. 

Update:

Plz plz solve this question fast it's urgent plz. 

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  • 2 months ago
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    7.

    ₹1 = 100 paise

    Cost of 2 dozen pencils

    = 72 × (12 × 2) paise

    = 1728 paise

    = ₹17.28

    Selling price of 2 dozen pencils

    = ₹7.20 × 2

    = ₹14.40 < ₹17.28

    Since the selling price is lower than the cost price, he lost.

    Loss percent

    = (Loss/Cost) × 100%

    = [(17.28 - 14.40)/17.28] × 100%

    = (16 2/3)%

    ≈ 16.67%

    ====

    8.

    Cost of 1 orange

    = 50/3 paise

    Selling price of 1 orange

    = 60/2 paise

    = 30 paise

    Gain percentage

    = (Gain/Cost) × 100%

    = {[30 - (50/3)] / (50/3)} × 100%

    = [(40/3) / (50/3)] × 100%

    = (40/50) × 100%

    = 80%

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