------------10æ-----------11æ--------------------------------12æ
å½ææ¶---60%10æ---60%11æ+30%10æ --------------- 60%12æ+30%11æ+10%10æ
åºæ¶-----40%10æ---40%11æ+ï¼1-60%-30%ï¼10æ----40%12æ+ï¼1-60%-30%ï¼11æ
æ以年æ«åºæ¶è´¦æ¬¾å©ä¸22000 ï¼40%12æ+ï¼1-60%-30%ï¼11æï¼ä¹å°±æ¯40%12æå10%11æã
ç±é¢ç®å¯ç¥ï¼11æå 4000,12æå 18000ï¼
æ以ï¼11æ=4000/10%
12æ=18000/40%
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