Using the gross requirements schedule in examples 4, 5, and 6 in the text, prepare an alternative

Question:

Using the gross requirements schedule in examples 4, 5, and 6 in the text, prepare an alternative ordering system of your own design that uses the same cost as in the example (setup at $100 each, holding at $1 per unit per period). Can you do better than the costs shown in the text? What is the cost of your ordering system?