Final answer:
The grocery store mark-up on a case of oranges is calculated by subtracting the fruit stand's selling price from the grocery store's selling price, which is $8.50 - $5.00, resulting in a mark-up of $3.50.
Step-by-step explanation:
The student's question involves calculating the grocery store mark-up for a case of oranges. The fruit stand sells the case for $5.00, while the grocery store sells it for $8.50. The mark-up can be found by subtracting the fruit stand's price from the grocery store's price.
To compute the grocery store mark-up, use the following calculation:
- Grocery store price: $8.50
- Fruit stand price: $5.00
- Mark-up = $8.50 - $5.00
This results in a mark-up of $3.50.
Therefore, the correct answer is:
A. $3.50