Answer:
8
Step-by-step explanation:
First, Fiona had 18 dollars, so Fiona spent 4.25, which would give her 13.75, but she needed to save 9.75, so 13.75-9. 75 = 4 dollars. So, Fiona would buy crackers, so the crackers would cost 50c, so how much will 50 give you 4 dollars? It will be 8, so the answer would be 8.