正确答案:B P`^{dH$P
答案解析:甲、乙、丙三种产品的边际贡献率分别为: Cyb-}l
甲:[(30-20)/30] ×100%=33.33% &tULSp@J
乙:[(25-15)/25] ×100%=40% f4s^$Q{Q
丙:[(22-11)/22] ×100%=50% D{](5?$`|
各产品的销售比重为: M=!RJ%6f
甲:[30×1000/(30×1000+25×5000+22×300)] ×100%=19% fDn| o"
乙:[25×5000/(30×1000+25×5000+22×300)] ×100%=77% +n
$ {6/
丙:[22×300/(30×1000+25×5000+22×300)] ×100%=4% NjCdkT&g
加权平均边际贡献率=33.33%×19%+40%×77%+50%×4%=39.13%。