Answer:
240
Step-by-step explanation:
Data provided in the question:
Annual demand, D = 12,000 units
Ordering cost, C = $6 per order
Holding cost = $2.50 per unit per year
Now,
Optimal order quantity =

on substituting the respective values, we get
or
Optimal order quantity =

or
Optimal order quantity = √57,600
or
Optimal order quantity = 240