第1个回答 2010-12-25
设甲乙两种商品的售价分别是x,y,甲商品的销量是100件,则
[100*x*40%+100*(1+50%)*y*60%]/(100*x+1.5*100*y)=50%
[x*40%+(1+50%)*y*60%]/(x+1.5*y)=50%
[x*4+1.5*y*6]/(x+1.5*y)=5
[4x+9y]/(x+1.5*y)=5
4x+9y=5(x+1.5*y)
4x+9y=5x+7.5y
1.5y=x
y=2x/3,
当甲乙两种商品的售量都是100时,总利润率
[(100*x*40%+100*(2x/3)*60%]/[100*x+100*(2x/3)]
=[(x*40%+(2x/3)*60%]/[x+(2x/3)]
=[(x*40%+(2x/3)*60%]/(5x/3)
=[2x/5+(2x/3)*3/5]/(5x/3)
=[2/5+(2/3)*3/5]/(5/3)
=[2/5+2/5]/(5/3)
=(4/5)/(5/3)
=4/5*3/5
=12/25
=48%
故总利润率是48%.本回答被网友采纳