Please help answer this question. I got a different answer from what someone previously posted. If you can please provided step by step so I can comprehend thank you.

The manager of a bookstore at City College purchases T-shirts from a vendor at a cost of $25 per shirt. The bookstore incurs an ordering cost of $100 per order, and the annual holding cost is 18% of the purchase cost of a T-shirt. The store manager estimates that the demand for T-shirts for the upcoming year will be 1,800 shirts. The store operates 50 weeks per year, five days per week.

The vendor is willing to offer a quantity discount to the bookstore according to the following schedule:

Order Quantity	Discount
0 to 499	0%
500 to 799	2%
800 to 999	3%
1,000 +	4%

1. Determine the optimal order quantity and the total annual inventory cost