To solve for how much Zoe spent on apples, we would need more context about the equation or problem related to the amounts you provided. Since no equation is given, we can only assume that one of the amounts represents what Zoe spent.
If you are looking for a single answer, I can only re-list the options:
- $5.25
- $1.25
- $2.50
- $6.75
Please provide additional information or a specific equation for a more precise solution.