Hey Chegg, I need help with this question, which comes from the concept check of my finance book?

Question:

What would be the profit or loss per share to an investor who bought the July 2012 expiration IBM call option with exercise price $180 if the stock price at the expiration date is $187? What about a purchaser of the put option with the same exercise price and expiration?

This is the answer, according to the book:

The payoff to the call option is $7 per share at expiration. The option cost is $5.50 per share. The dollar profit is therefore $1.50. The put option expires worthless. Therefore, the investor's loss is the cost of the put, or $2.11.

Can you explain to me or show me the work as to how they arrived at these answers because I am confused.