20.
a.
Shipping - Product Mix A produce
dealer in Florida ships oranges, grapefruits, and avocados to New
York by truck. Each truckload consists of 100 crates, of which at
least 20 crates must contain oranges, at least 10 crates must
contain grapefruits, at least 30 crates must contain avocados, and
there must be at least as many crates of oranges as grapefruits.
The profit per crate is $5 for oranges, $6 for grapefruits, and $4
for avocados. How many crates...