9. A book-binder has one printing press, one binding machine and the manuscripts of a number of different books. The time required to perform the printing and binding operations for each book are shown as follows:

Determine the order in which the books should be processed in order to minimise the total time required to tum out all the books.

Book Printing time (hrs) Binding time (hrs) - 88 2 30 120 80 100 90 35 w 50 20 428 60 535 6 90 100 30 10