$31$ Table Summary: A table has $5$ columns. Column $1$ lists account names, while columns $2$ to $5$ are titled Sales, Cost of Sales, Gross Margin Percentage, and Industry Averages. Columns $2$ and $3$ list dollar amounts, while column $4$ is left blank, and column $5$ lists numerical values.

Sales$$ Cost of Sales$$ Gross

Margin

Percentage$$

Industry

Averages

New Course Books$$ $$1,086,800$ $ $742,56725\mathrm{.}4$

Used Course Books$468,200318,22232\mathrm{.}6$

Custom Published Books$212,222159,29325\mathrm{.}6$

Textbook Rental Sales $102,32390,32322\mathrm{.}1$

Course Technology$90,60080,43211\mathrm{.}2$

Trade Books$68,40040,35624\mathrm{.}3$

Professional Reference Books $22,33015,20031\mathrm{.}0$

Total Book Sales$$ $$2,050,875$ $$1,446,39326\mathrm{.}5$

Total Nonbook Sales$$ $$823,578$ $$612,23329\mathrm{.}7$

Total Net Sales $$2,874,453$ $$2,058,62628\mathrm{.}3$

Calculate the gross margin percentage for each of State University$$s product lines.

$$

Compare State University$$s gross margins to industry averages. Indicate any margins that appear out of line, in relation to the industry.