Answer: Product A is the cheapest unit price.
Explanation:
Since we have given that
Weight of a Product A = 8 oz
Cost at which it is sold = $1.36
Cost per unit for Product A will be

Weight of a Product B = 16 oz
Cost at which it is sold = $3.20
Cost per unit for Product B will be

So, we can see that the unit price of "Product A" is lower than the unit price of product B .
Hence, Product A has the cheapest unit price.