A European call option written on one share of Medident Corp. has the following parameter values: S = $220, X = $200, r = 5% p.a., sigma = 20% p.a., T = 9 months. Find the call option's premium, rounded to 2 decimals (e.g., 3.24). Do NOT include the $ sign in your answer; write only the numerical value. NOTE: Use the continuous time version of the Black-Scholes equation (i.e., do NOT use the book's version).