In Boise, Idaho, $5$ workers, each making the equivalent of $$6$ per day, can produce $40$ units per day. In Billings, Montana, $10$ workers, each making the equivalent of $$4$ per day can produce $45$ unit. In Fargo, North Dakota, $2$ laborers each making $$120$ per day, can make $100$ units. Based on labor cost only, which location would be most economical to produce the item?

What is Boise's labor cost per unit?

What is Billings' labor cost per unit?

What is Fargo's labor cost per unit?

Which location would be most economical ts produce the item?