债券资本成本:1000X10%X(1-33%)/[1000X(1-2%)]=6.84%,优先股资金成本:500X12%/(500-15)=12.37%综合资金成本:6.84%X1000/(1000+500+1000)+12.37%X500/(1000+500+1000)+15%X1000//(1000+500+1000)=11.21%。