7. (Requires Numerical Analysis)
(a) Write down the probability density function of the risk-neutral terminal distribution of returns for stocks in the Black-Scholes model.
(b) Then write down the expression for the value of a call option on a stock in integral (expectation) form under the risk-neutral probability measure.
(c) For the following parameter values, undertake the integration using Octave and price the call option: S = 100, strike K = 102, volatility risk-free rate r = 0.02, and maturity T = 0.5.
Assume there are no dividends.
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