Many years ago, a neighborhood lunch counter charged 15 cents for a cup of coffee and 15 cents for a buttered hard roll. One day, a customer ordered the two items and was told that the total price was 35 cents. When the customer asked which of the two items had been raised by 5 cents, the owner’s condescending reply was, “Which do you think?” In your opinion, which of the two items was affected and why?