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$100一天有個年輕人來到王老闆的店裏買了一件禮物,這件禮物是21元.結果是這個年輕人掏出100元要買這件禮物=$0王老闆當時沒有零錢,用假錢換真錢返黎 = $0 +$100 = +$100找俾年輕人 = +$100 - $79 = +$21王老闆無奈還了街坊100元 = +$21 - $100 = -$79$21禮物for年輕人 = -$79- $21 = -$100
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