Probability #1

[REL18]

In the process of cleaning out her closet, Susie found a book that she would like to sell. She has been offered $50 by a friend who would like to buy the book. However, after doing some research, she found out that if she sells it on E-bay she would have a 50% chance of getting $100, a 25% chance of getting $50 and a 25% chance of getting $10. There is a fee of $5 to sell the book on E-bay. Assume that Susie gets no benefit from helping her friend.