A债券目前的价值
=100×6%×[(P/A,5%,4)+1]+100×(P/F,5%,4)
=100×6%×(3.5460+1)+100×0.8227
=109.546(元)(1.5分)
由于低于目前的市价,所以不值得投资。(1分)
B股票目前的价值
=1.2×(1+4%)×(P/F,10%,1)+1.2×(1+4%)^2×(P/F,10%,2)+1.2×(1+4%)^3×(P/F,10%,3)+1.2×(1+4%)^4×(P/F,10%,4)+20×(P/F,10%,4)
=1.2×1.04×0.9091+1.2×1.0816×0.8264+1.2×1.1249×0.7513+1.2×1.1699×0.6830+20×0.6830
=17.84(元)(1.5分)
由于高于目前的市价,所以值得投资。(1分)