目标售价:10(1 - x%)
原利润:10 - 8 = 2
目标利润是原利润的90&:(10 - 8)X 90% = 1.8
所以,目标售价 = 成本 + 目标利润 = 8 + 1.8 = 9.8
降价0.2
x = 0.2/8*100%
x = 2.5
目标售价:10(1 - x%)
原利润:10 - 8 = 2
目标利润是原利润的90&:(10 - 8)X 90% = 1.8
所以,目标售价 = 成本 + 目标利润 = 8 + 1.8 = 9.8
降价0.2
x = 0.2/8*100%
x = 2.5