@AgustinLebron3 Or they have already finalized the transaction on the register before seeing how much you're giving them, and don't want to admit they can't figure out the change on their own so they give you back $20.15 or some other random amount that isn't plausible.
@AgustinLebron3 或者他们在看到你给他们多少钱之前已经在登记册上完成了交易，并且不想承认他们自己无法弄清楚变化，所以他们给你 20.15 美元或其他一些随机的不合理的金额。