[简答题] 甲公司2015年年末长期资本为5000万元，其中长期银行借款1000万元，年利率为6％，所有者权益（包括普通股股本和留存收益）为4000万元，公司计划在2016年追加筹集资金5000万元，其中按面值发行债券2000万元，票面年利率为6．86％，期限5年，每年付息一次，到期一次还本，筹资费率为2％，发行优先股筹资3000万元，固定股息率为7．76％，筹资费用率为3％，公司普通股β系数为2，一年期国债利率为4％，市场平均报酬率为9％，公司适用的所得税税率为25％，假设不考虑筹资费用对资本结构的影响，发行债券和优先股不影响借款利率和普通股股价。 计算甲公司发行优先股的资本成本。

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