The current price of a non-dividend-paying stock is $30. Over the next six months it is expected to rise to $36 or fall to $26. Assume that the risk-free rate is 10%. What, to the nearest cent, is the value of a 6-month European call option on the stock with a strike price of $33?
Upmove (U)= High price/current price=36/30=1.2 | ||||||
Down move (D)= Low price/current price=26/30=0.8667 | ||||||
Risk neutral probability for up move | ||||||
q = (e^(risk free rate*time)-D)/(U-D) | ||||||
=(e^(0.1*0.5)-0.8667)/(1.2-0.8667)=0.55381 | ||||||
Call option payoff at high price (payoff H) | ||||||
=Max(High price-strike price,0) | ||||||
=Max(36-33,0) | ||||||
=Max(3,0) | ||||||
=3 | ||||||
Call option payoff at low price (Payoff L) | ||||||
=Max(Low price-strike price,0) | ||||||
=Max(26-33,0) | ||||||
=Max(-7,0) | ||||||
=0 | ||||||
Price of call option = e^(-r*t)*(q*Payoff H+(1-q)*Payoff L) | ||||||
=e^(-0.1*0.5)*(0.553813*3+(1-0.553813)*0) | ||||||
=1.58 |
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