Problem 3
Formula of black scholes
C= St N(D1) - Ke -rt N(D2)
Where
D1 =[ Ln St/ K + ( r + Variance / 2) t ] / ( SD√t)
D2 = D1- SD √t
Where
C = Price of call option
S = Current stock prive
K = strike price
r = risk free rate
t = time to maturity
N = normal distribution
Hence
C = $20 N(D1) - $25 e -.01*(6/12) N (D2)
D1 = [Log ($20/$25) + (0.01+ 0.20 2 / 2) (6/12)] / (0.20 √6/12)
D2 = D1 - (0.20 *√6/12)
e is the exponential value measuring 1.0272
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