Answer:
Books in inventory= 66.5%
Explanation:
First, we determine the number of books sold:
Books sold= 75 + 50 + 64 + 78 + 135= 402 books
Now, using the following formula, the percentage of books in inventory:
Books in inventory= [(books sold/total books) -1]*100
Books in inventory= [1 - (402/1,200)]*100
Books in inventory= 66.5%