1. Compares menus vs food cost vs sales price.

2. The food cost £4 , but I only paid £3 so I still owe £

3. Axolotl care, tanks, habitat, diet, buying, life span, food, cost, breeding, regeneration, health, medical research, fun facts, and more all included

4. Axolotl: Axolotl care, tanks, habitat, diet, buying, life span, food, cost, breeding, regeneration, health, medical research, fun facts, and more all & Information: A Complete Pet Owner's Guide

5. The objective function on line 20 minimizes the total food cost as the total of each decision variable (amount of food) multiplied by that food's cost per unit.