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27. a. ˰ÊÕµÄÅÝĵ¼ÖÂÆ½¾ù˰Âʽ¥½¥Óë±ß¼Ê˰ÂÊ³ÖÆ½£¬´Ó¶øÏû³ýÁ˸ßÀûÈóÆóÒµµÍ±ß¼Ê˰ÂʵÄ˰ÊÕÓÅÊÆ¡£
b. ¼ÙÉèÓ¦½»Ë°¿îÊÕÈëÊÇ100000ÃÀÔª£¬ÄÇôËùµÃ˰½«»áÊÇ£º ËùµÃ˰=0.15($50K) + 0.25($25K) + 0.34($25K) + 0.39($235K) = $113.9K
ƽ¾ù˰ÂÊ=$113.9K / $335K = 34%
δÀ´ÃÀÔªÊÕÈëµÄ±ß¼Ê˰ÂÊÊǰٷÖÖ®ÈýÊ®ËÄ¡£
µ±ÆóÒµµÄÓ¦ÄÉ˰ÊÕÈëˮƽ´¦ÓÚ$335K µ½$10M,Ö®¼äʱ£¬Æ½¾ù˰ÂÊÓë±ß¼Ê˰ÂÊÏàµÈ¡£
ËùµÃ˰= 0.34($10M) + 0.35($5M) + 0.38($3.333M) = $6,416,667
ƽ¾ù˰ÂÊ=$6,416,667 / $18,333,334 = 35% δÀ´ÃÀÔªÊÕÈëµÄ±ß¼Ê˰ÂÊÊǰٷÖÖ®ÈýÊ®Îå¡£
µ±ÆóÒµµÄÓ¦ÄÉ˰ÊÕÈëˮƽ³¬¹ý$18,333,334ʱ£¬Æ½¾ù˰ÂÊÔÙ´ÎÓë±ß¼Ê˰ÂÊÏàµÈ¡£
c. ËùµÃ˰=0.34($200K) = $68K = 0.15($50K) + 0.25($25K) + 0.34($25K) + X($100K); X($100K)
= $68K ¨C 22.25K = $45.75K
X = $45.75K / $100K X = 45.75%