Scott would save 9.05% of the new book cost if he buys the used book.
First find out how much he saves by buying the used book.
If he buys the used book, the amount he will save is:
= New book cost - Old book cost
= 221 - 201
= $20
The percentage of the new cost that this is:
= Amount saved / Cost of new book x 100%
= 20 / 221 x 100%
= 9.05%
Scott would therefore save 9.05% of the cost of the new book if he buys the used book.
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