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On Sunday, Belmond Public Library has 160 books, none of which have been checked out. On Monday, 40 of the books are checked out. On Tuesday,$$\frac{1}{2}$$of the borrowed books are returned. Wednesday,$$\frac{1}{2}$$of the books still checked out are returned and then 20 more are checked out. On Thursday, a wealthy patron donates 80 books, and$$\frac{1}{6}$$of the books still checked out are returned. On Friday 30 more books are borrowed, and on Saturday 35 are checked out. What is the percent change from the books in the library at the end of the day on Monday to the books in the library at end of the day the following Saturday
_____percent
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