Answer the question about text:

Apparently August was Chinese month as the hot trays were laden with broccoli tofu , stir fried veggies , and white rice . I managed to keep my lunch under a pound , but just barely . To that I added one bottle of organic guava kombucha and I was all set . When I got to the checkout counter , I dutifully handed over my basket , reached for my wallet , and prepared myself for the worst .

Why did they have to prepare themselves for the worst ?
They expected to not have enough money for their purchase .