Inc Ricardo and Lidia own a small bakery that makes fresh cookies daily. They bake two
kinds of cookies -- plain cookies and cookies with icing. The cookies are sold by the
box. Ricardo and Lidia are confident they can sell all the cookies they make. One box
of plain cookies requires 1.2 pounds of cookie dough. One box of iced cookies
requires 0.9 pounds of cookie dough. Ricardo and Lidia have 72 pounds of cookie
dough. Plain cookies require no icing. One box of iced cookies requires 0.4 pound of
icing. Ricardo and Lidia have 20 pounds of icing. One box of plain cookies requires
about 0.10 hour to prepare. One box of iced cookies requires about 0.15 hour to
prepare. Ricardo and Lidia have 9 hours for preparation. Suppose the profit on each
box of plain cookies is $3.00, and the profit on each box of iced cookies is $4.00. How
many boxes of each kind of cookie should Ricardo and Lidia make to maximize profit?