Problem 3 [4 points] Use the Black-Scholes formula that we discussed in class (see also Problem 1 of Assignment Sheet 5) and plot the call price C against (a) the stock price S, (b) the interest rate r, (c) the volatility . For each plot, use reasonable parameters. Problem 3 [4 points] Use the Black-Scholes formula that we discussed in class (see also Problem 1 of Assignment Sheet 5) and plot the call price C against (a) the stock price S, (b) the interest rate r, (c) the volatility . For each plot, use reasonable parameters