A.1000200/500/1000 B.1000200/500/2 C.1000200/500/100/3 D.1000200/500/100
A.1-1/2*(50.6-50) B.1-1/2*(50.6-0.6) C.1-1/3*(50.6-50)/2 D.1-1/2*(50.6-50)/3
A.180 B.184 C.183 D.182