Final answer:
The price per ounce of tuna went up by $0.10 when the can size was reduced from 6 oz to 5 oz, with the selling price of the can remaining at $3.00.
Step-by-step explanation:
The student is asking about the change in price per ounce when the can size of tuna is reduced from 6 ounces to 5 ounces, while the selling price remains $3.00. To calculate this, we need to find out the price per ounce before and after the can size change.
Initially, the price per ounce is $3.00 divided by 6 ounces, which is $0.50 per ounce. After the reduction, the price per ounce becomes $3.00 divided by 5 ounces, which gives us $0.60 per ounce.
To find the increase in price per ounce, we subtract the original price per ounce from the new price per ounce, which is $0.60 - $0.50 = $0.10. Therefore, the price per ounce of tuna went up by $0.10 when the tuna companies reduced the can size from 6 oz to 5 oz.