QQ???????????????????????
?????:???????????????????????????
???????????Щ????????????е?,???????????????,????????????????????
?o??????????а?????????,??????????????,???????
?????????????????????
????? - 400(??????)
???? - 200(??200)
??? - 900(?500)
??????????60%????,??????100000??????160000??Ч??
?????????????????:
????300000,????180000,??????480000
10000=400(???????)*25(??ο?25????)
????25*48=1200??????
????80??????80???????(???????),???????????????????????1/15????
???
???:300000
???:??e??????飬?????Ч?????
????:
??????а????:0.6*300000=180000
????:80*250+80*450=56000
?????????:80*0.02(???)+80*0.03(?????)+0.2*2(У??,?????)=4.4%
????????????????????????????????????????40407???????40407????????
