Q: Currently YL trading at $54. Lee bought YL April $55 put option for $2.25. At expiration, YLs price is 53.75, What is the option payoff? Profit?

Solution: ITM Put Long Position Payoff = 1.25 Profit/Loss = 1.25 -2.25 = -1.00

Above is the question and the solution but, I am confused on how they came to this solution. Any help would be appreciated!