A.80 B.100 C.110 D.120
A.10000×0.1%×(1+0.1)×(1-20%) B.10000×0.1%×(1+0.1)/(1-20%) C.10000×1%×(1+0.1)×(1-20%) D.10000×1%×(1+0.1)/(1-20%)