Answer and Explanation:
a. The computation of the economic order quantity is shown below: 


= 3,761 units 
b. The number of orders would be equal to 
= Annual demand ÷ economic order quantity 
= 400,000 ÷ 3,761 units 
= 106.35 orders 
c. The computation of the total cost is shown below: 
= Purchase cost + ordering cost + carrying cost 
where, 
Purchase cost = Annual consumption × Cost per unit
 = 400,000 × $9
 = $2,800,000
Ordering cost = (Annual demand ÷ EOQ) × Cost to place one order 
 = (400,000 ÷ 3,761) × $35
 = $3,723
Carrying cost = (EOQ ÷ 2) × carrying cost percentage × Cost per unit 
 = (3,761 ÷ 2) × 22% × $9 
 = $3,723
Now put these values to the above formula 
So, the value would equal to 
= $2,800,000 + $3,723 + $3,723
= $2,807,446