Owner and operator of the Earplug Superstore, is reviewing the costs associated with the store's best-selling hearing aid, the BZ15. The data available concerning this device is below:
Demand = 25 units / week
Order cost = $3/order
Hooding cost = $1.5/unit/year
The store operates 52 weeks a year.
If the owner orders such that his annual holding cost is twice what his annual ordering cost is, how many units at a time is he ordering?