Think about your decision to buy the textbook for this course. you paid $250 for the book, but you would have been willing to pay $450 to use the book for the semester. suppose that at the end of the semester you could keep your textbook or sell it back to the bookstore. once you have completed the course, the book is worth only $50 to you. the bookstore will pay you 50% of the original $250.

how much total value have you gained? $

Hello! First, you must think of what the value is worth to you personally. (Which is $50. However, the store is willing to pay 50% of that 250 original price. So you must do simple math and find out what half of 250 is! That gives us 125. When you figure that the value is 125 after 50% off and your personal value for the book was $50 all you have to do is subtract 125 from 50 which gives us your answer!

I hope this helped!

I am, yours most sincerely,
Joshua A. Bunn