P = $16
P(u) = $20
P(d) = $12
rRF = 3%
X = $15
Cu ending up option payoff = Max[(20 - 15), 0] = $5
Cd ending down option payoff = Max[(12 - 14), 0] = $0
Share of stock (Ns) = [Cu - Cd] / [P(u) - P(d)]
= [$5 - $0] / [$20 - $12] = 5 / 8 = 0.625
Hedge portofolio’s payoff if stock is up = [Ns * P(u)] - Cu
= [0.625 x ($20)] - $5= $7.5
Hedge portofolio’s payoff if stock is down = [Ns * P(d)] - Cd
= [0.625($12)] - $0 = $7.5
PV of riskless payoff = $7.5 / [{1 + (rRF / 365)}365(t/n)]
= $7.5 / [{1 + (0.03 / 365)}365(0.5/1) = $7.5 / 1.0151 = $7.39
Option’s Value (VC) = [Ns x P] - Present value of riskless payoff
= [0.625 x $16] - $7.39 = $2.61
eBook Problem 8-07 Binomial Model The current price of a stock is $16. In 6 months,...
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