Answer: The unit price of the 120-fluid-ounce bottle of shampoo is $0.06 per fluid ounce.
Step-by-step explanation: To find the unit price of a 120-fluid-ounce bottle of shampoo that costs $7.20, we need to divide the total cost by the number of fluid ounces in the bottle.
Unit price = total cost/number of units
In this case, the total cost is $7.20 and the number of fluid ounces is 120. So the unit price is:
Unit price = $7.20 / 120 fluid ounces
Unit price = $0.06 per fluid ounce
Therefore, the unit price of the 120-fluid-ounce bottle of shampoo is $0.06 per fluid ounce.