问题如下:
A European put option has the following characteristics: S0 =$50;X=$45;r=5%;T=1year;andσ=25%. Which of the following is closest to the value of the put?
Use the BSM formula to solve this question. N(-0.78644)=0.2158, N(-0.74644)=0.2266, N(-0.49644)=0.3085, N(-0.56644)=0.2855
选项:
A. $1.88.
B. $3.28.
C. $9.07.
D. $10.39.
解释:
A S0 =$50; X=$45; r=5% T=1year and σ=25%
d2=0.74644-0.25=0.49644
from the cumulative normal table:
N(-d1)=0.2266
N(-d2)=0.3085*
(*note rounding)
请问可以给一下d1和d2公式吗 感觉和书上不太一样