What is the cost per ounce if a 1.8 ounce jar of cinnamon costs 4.05?

To find the cost per ounce, divide the total cost of the jar by its weight in ounces. For a 1.8-ounce jar costing $4.05, the calculation is ( \frac{4.05}{1.8} ), which equals $2.25 per ounce.