A.8 B.16 C.24 D.30
A.80% B.85% C.89% D.93%
A.7~12 B.8~13 C.9~14 D.10~15
A.2~3 B.3~4 C.4~5 D.5~6
A.98% B.98.5% C.99% D.99.5%