Final answer:
Mrs. Jameson paid for the shirt he kept by subtracting the refund from the total amount spent.
Step-by-step explanation:
The correct answer is option a) $52.85 - $28.54.
To find out what Mr. Jameson paid for the shirt he kept, you subtract the amount he received as a refund from the total amount he spent.
So, the expression that represents what Mrs. Jameson paid for the shirt he kept is $52.85 - $28.54.