Hasan plans to choose a book from a section of the store where everything is 25% off. He writes the expression d−0. 25d to find the sale price of the book if the original price is d dollars. Bella correctly writes another expression, 0. 75d, that will also find the sale price of the book if the original price is d dollars. Use the drop-down menus to explain what each part of hasan's and bella's expressions mean.