Q. Go to yahoo finance. What is the last price for an option on Apple stock with expiration of June 15th , 2018 and exercise price of $175?

I went to yahoo finance and the last price for this option was 91.25, but I am not sure if its right. I am getting confused and all mixed up.

a. Now Suppose you buy this option. What is the price that you pay? If the stock price on June 15th , 2018 is $180, will you exercise your call? What is the profit on your position?

b. If you have a June call with exercise price $155 and the stock price on June 15th, 2018 is $180, will you exercise your call? What is your payoff on your position?

c. If you have a June call with exercise price $220 and the stock price on June 15th, 2018 is $180, will you exercise your call? What is your payoff on your position?

If I need to, I will split up these questions into three separate questions, but please help. Can you check Yahoo Finance to double check what I saw was right? Thank you.