I think you may have copied this down wrong? If you are looking to the answer to the question given the x and 2 items shouldnt matter, because you said that she started with 20$ and ended with 10.98. No matter what the process and/or what she bought it will be 20-10.98 to find out how much she spent. The answer is 9.02. Hopefully I was helpful let me know if you need any follow up.