A bookstore sells books in several formats hardcover, paperback, digital, and audio. Based on past sales, the

Question:

A bookstore sells books in several formats€” hardcover, paperback, digital, and audio. Based on past sales, the table below gives the estimated probability that a randomly selected purchase will be of a particular type.

If a purchase is selected at random, what is the probability that this purchase is for a book that is
a. Digital or audio?
b. Not digital?
c. A printed book?