C=HS-PV(B)에 따르면 상향등락할 때 옵션값 Cu=6.35*1.05-6.4=0.2675=HSu-B,
등락할 때 하향, 옵션값=0=HSd-B, Su=6.35*1.05=6.6675, Sd=6.35*0.95=6.0325
H=0.2675/(6.6675-6.0325)=0.4213, PV(B)= 6.0325* 0.4213/1.01=2.5163
C=6.35*0.4213-2.5163=0.159