Answer:
161 units
Step-by-step explanation:
Economic order quantity = √[(2 x annual demand x orderign cost) / annual holding cost per unit]
annual demand = 500 units
ordering cost = $1,000
holding cost = $550 x 7% = $38.50
EOQ = √[(2 x 500 x $1,000) / $38.50] = 161.16 units ≈ 161 units