Answer:
$5.3
Explanation:
1) Ask yourself: How much money is left to spend? 
- Subtract the cost to rent the park shelter: 
3,500 - 250 = 3,250
- Find the total amount of money spent on gifts for students: 
300 * 5.50 = 1,650 
- Subtract the total money spent on gifts for students: 
3,250 - 1,650 = 1,600 
2) Ask yourself: How much can be spent per student? 
- Divide the money left by the number of students: 
1,600 / 300 = 5.3