? 發問於 科學及數學數學 · 1 十年 前

急 20分 Form . 1. 英文數學題

急 20分 Form . 1. 英文數學題

Mr Lam bought 30 mobile phones at $1600 each in July. The price increased to $1750 in August and then decreased to $1400 in September. If Mr Lam sold 16 and 14 mobile phones in August and September respectively, how much did he gain or loss?

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1 個解答

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  • Samuel
    Lv 6
    1 十年 前
    最佳解答

    Mr Lam paid for 30 mobile phones in July

    = $1600(30)

    = $48000

    the sold price of 16 mobile phones in August

    = $1750(16)

    = $28000

    the sold price of 14 mobile phones in September

    = $1400(14)

    = $19600

    Change

    = $(28000 + 19600) - $48000

    = - $400

    ∴ Mr Lam loss $400

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