Product Line Sales Cost of Sales Gross Margin % Industry Averages New Course Books $1,086,800 $742,567 25.4 Used Course Books 468,200 318,222 32.6 Custom Books 212,222 159,293 25.6 Textbook Rentals 102,323 90,323 22.1 Course Technology 90,600 80,432 11.2 Trade Books 68,400 40,356 24.3 Reference Books 22,330 15,200 31.0 Total Book Sales $2,050,875 $1,446,393 26.5 Total Non-Book Sales $823,578 $612,233 29.7 Total Net Sales $2,874,453 $2,058,626 28.3 Above is a sales report by product line for State University. Perform analytical procedures on State University's Sales accounts by calculating the Gross Margin % by product line and comparing to the industry average. Any differences within 1% of our expectation (industry average) can be accepted without investigation. Mark all product lines that must be investigated further.