The student bookstore had a textbook for sale at $89.95. A student found the textbook on eBay for $62.00. If the student bought the book on eBay, what percentage of the cost of the bookstore book did she save?

She saved $27.95

100(27.95/89.95) = _________%

To find out what percentage of the cost of the bookstore book the student saved, we need to first calculate the difference in prices and then divide it by the original cost. Here's how:

Step 1: Calculate the difference in prices:
The student found the textbook on eBay for $62.00, while the bookstore is selling it for $89.95.
Difference = Bookstore price - eBay price
Difference = $89.95 - $62.00 = $27.95

Step 2: Calculate what percentage of the bookstore price the student saved:
Percentage saved = (Difference / Bookstore price) * 100
Percentage saved = ($27.95 / $89.95) * 100

To find the exact percentage, we can use a calculator or perform the calculation manually:

Percentage saved = (0.311560) * 100
Percentage saved ≈ 31.16%

Therefore, the student saved approximately 31.16% of the cost of the bookstore book by buying it on eBay.