數學題……好簡單

The discount = $320 * 40% = $128
This is 64% of the cost price, therefore cost price = $128 / 64% = $200
The selling price = $320 - $128 = $192
The loss is (200 - 192)/200 * 100% = 4%

2009-11-22 17:47:57 補充：
the discount is 64% of the cost price
cost price * 64% = $128
cost price = $128 / 64% ......

電腦遊戲明顯是320美元的折扣出售40％。如果折扣為64％的成本價格，找到利潤或虧損百分之?
自己計,我不熟.我未到中1,你自己做,我幫你睇左
^^,加油!

80!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!