Answer:
She paid 8 dollars for the comic book
Step-by-step explanation:
She bought a sandwich that cost $2 for 3 days so when you multiply that she spent a total of $6 on sandwiches that week. Then you subtract 6 from 30 and get 24 then you divide that by 3(the amount of day she went to the store that week) and you should end up with $8.