Aplane delivers cargo in two types of crates between two destinations. the light crate is 16 cubic feet in volume and 1100 pounds in weight, and earns $24 in revenue. each heavy crate is 24 cubic feet in volume and 400 pounds in weight, and earns $33 in revenue. the plane has available at most 1312 cubic feet and 70200 pounds for the crates. finally, at least twice the number of light crates as the heavy ones must be shipped. find the number of crates of each type of cargo to ship in order to maximize revenue. x =