一样商品售价是12¥,在3000件和4000件的时候是利润是不一样的,利润公式是Y=(-2)(X-5)^2 +10。其中X代表以千为记数单位的商品件数;Y代表以千为记数单位时的利润。问生产4000件时比生产3000件时,每件商品成本少了多少百分比?做法:代入,4千件时,利润是8;3千件时,利润是2。第二步,4千件时,成本是4;3千件时,成本是10。(10/3-4/4)/(10/3)=70%应该是这样吧,大家可以再看看。写到这里我发现我好像考试时算成了利润减少的百分比 Basically this question tells you that the profit for 4000 products is 8 per product while that for 3000 is 2 per product. As the price for the product is the same at 12, then the cost is 4 at 4000 and 10 at 3000. So when production increased from 3000 to 4000, the cost reduction percentage = 6/10 = 60% -- by 会员 sdcar2010 (2010/12/7 5:27:50)
是呀我算出来也是60% 不知道他这个什么70%这个东东怎么出来的 |