Final answer:
To find the price per ounce of the grapes, we convert the pounds to ounces and divide the total cost by the number of ounces. The price per ounce is $0.23.
Step-by-step explanation:
To find the price per ounce, we need to convert the 9-pound box of grapes into ounces. Since there are 16 ounces in 1 pound, we multiply 9 by 16 to get 144 ounces.
Next, we divide the total cost of $33.12 by 144 ounces to find the price per ounce.
$33.12 divided by 144 equals $0.23 per ounce.
Therefore, the price per ounce of the grapes is $0.23 per ounce.