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The long party purchased the option to buy the stock at $27.50. The stock price goes to $22. The long party is not going to buy the stock at $27.50 when he can buy it at the market price of $22 instead. So the option expires worthless. The long party’s loss is the amount paid to purchase the option: $3.50 times 100 shares, or $350. The short party, or the party who wrote and sold the option, gets to keep the stock and the amount received for the sale of the option, so his gain is the same $350 that the long party lost on the transaction.
This is the market price of the 100 shares ($3,075) on January 5 minus the cost of the option on the 100 shares ($350) minus the market price of the 100 shares on the expiration date ($2,200).
This is the price of an option to buy one share multiplied by 100 shares.
This is the strike price of the 100 shares ($2,750) minus the cost for the option ($350) minus the market price of the 100 shares on the expiration date ($2,200).