Help me check this 6 part question please!

Thomas is the purchasing manager for the headquarters of a large insurance company chain with central inventory operations. Thomas's inventory item has a demand of 6000 units per year. The cost of each unit is $100, and the inventory carrying cost is $10 per unit per year. The average ordering cost is $30 per order. It takes about 5 days for an order to arrive, and the demand for 1 week is 120 units. (We assume 250 working days per year.) ( 20 pts) a) What is EOQ? b) What is the average inventory if the EOQ is used? c) What is the optimal number of orders per year? d) What is the optimal number of days in between any two orders? e) What is the annual cost of ordering and holding inventory? f) What is the total annual inventory cost, including the cost of the 6000 units