I'm having issues finding the answer to anything relating to the $55 unit cost. Here is the full problem, including the answers that I've been able to find thus far:

Ergonomics Inc. sells ergonomically designed office chairs. The company has the following information: Average demand = 24 units per day Average lead time = 30 days Item unit cost = $55 for orders of less than 220 units Item unit cost = $53 for orders of 220 units or more Ordering cost = $27 Inventory carrying cost = 20% The business year is 260 days. Assume there is no uncertainty at all about the demand or the lead time

(1)Calculate EOQ if unit cost is $55 and $53. (Round up your answer to the next whole number.)

Unit cost at $55 = 175 units

Unit cost at $53 = 178 units

(2)Calculate annual ordering costs for each alternative? (Round your answers to 2 decimal places.Omit the "$" sign in your response.)

Unit cost at $55 = $

Unit cost at $53 = $ 765.82

(3)Calculate annual inventory carrying costs for each alternative? (Round your answers to 2 decimal places. Omit the "$" sign in your response.)

Unit cost at $55 = $

Unit cost at $53 = $ 1,166

(4)Calculate annual product costs for each alternative? (Omit the "$" sign in your response.)

Unit cost at $55 = $ 343,200

Unit cost at $53 = $ 330,720

(5)What will be the total costs for each alternative? (Round your answers to 2 decimal places.Omit the "$" sign in your response.)

Unit cost at $55 = $

Unit cost at $53 = $ 332,651.82

(6)How many chairs should the firm order each time?

Order quantity = 220 chairs

(7)How much the firm can save by placing the order? (Round your answers to 2 decimal places.Omit the "$" sign in your response.)

Save = $