Set up the following linear programming problem. 12. A pet store sells large angelfish for $20 each and silver dollarfish for $16 each. Each angelfish requires 5 hours of care and 4 ounces of flake food to reach full size, and each silver dollarfish requires 4 hours of care and 8 ounces of flake food to reach full size. The pet store has 288 ounces of food and 240 hours of care available to raise the two kinds of fish. The store wants to sell a minimum of 12 angelfish and 10 silver dollarfish. If the store wishes to maximize the revenue obtained from selling angelfish and silver dollarfish, how many of each kind of fish should be raised to full size?