仅供参考：
普通股资本成本=800*14%/[800*1.5*(1-2%)]+1%=10.52%
借款成本=500*5%*60%/(500-20)=3.13%
债券成本=500*7%*60%/（550-5）=3.85%
筹资金额=1176+480+545=2201
加权成本=10.52%*1176/2201+3.13%*480/2201+3.85%*545/2201=5.62%+0.68%+0.95%=7.25%
