An electronic store sells 1100 model X computers annually. Annual carrying cost is 12% of the unit cost. Order cost is $80. The lead time for receiving computers is 5 days. The supplier offers discounted prices for the store based on order quantity as given below:

Order quantity (Q)	Unit Price ($)
Q < 50	440
50 <=Q <75	420
75 <= Q < 99	400
Q >= 100	390

Give your answers to two decimal places.

1. Find the minimum cost order quantity at price level $400

2. Find the optimal order quantity

3. Find the annual ordering cost for optimal order quantity

4. Find the annual holding cost for optimal order quantity