The Black-Scholes Formula. Step-by-step required.

Pls dont copy others' answer on Chegg bcz they did wrong.

Exercise 7.2 The prices of a certain security follow a geometric Brown- ian motion with parameters u = .12 and o = .24. If the security's price is presently 40, what is the probability that a call option, having four months until its expiration time and with a strike price of K = 42, will be exercised? (A security whose price at the time of expiration of a call option is above the strike price is said to finish in the money.) ==