A shirt company produces t-shirts with graphics of professional sports teams. A retail store wants to order exactly 100 shirts, with the following requests. The revenue, per shirt, for football is $20, baseball is $18, basketball is $17, and hockey is $12. How many of each shirt should be sold to the store to maximize revenue and meet the requests?

At most 20 should be football.

At most 25 should be baseball.

At most 50 should be basketball.

At most 30 should be hockey.

At least 10 should be football.

At least 20 should be baseball.

At least 15 should be basketball.

At least 25 should be hockey.