长期借款的资本成本=8%*(1-25%)=6%
债券的资本成本=8%/(1-4%)*(1-25%)=6.25%
优先股的资本成本=10%/(1-5%)=10.53%
普通股的资本成本=12%/(1-3%)+4%=16.37%
综合资本成本=(1000*6%+1000*6.25%+500*10.53%+2500*16.37%)/5000=11.69%
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