题目解析:
选项A,15×(1+0.005)12+0.4×[(1+0.005)12-1]/0.005=20.86(万元)
选项B,15×(1+0.005)24+0.4×[(1+0.005)24-1]/0.005=27.08(万元)
选项C,15×(1+0.005)36+0.4×[(1+0.005)36-1]/0.005=33.68(万元)
选项D,15×(1+0.005)72+0.4×[(1+0.005)72-1]/0.005=56.04(万元)
选项E,15×(1+0.005)120+0.4×[(1+0.005)120-1]/0.005=92.84(万元)
故本题选D,E。