Duncan felt he had been careless.
He had considered that Alice lacked the common knowledge required to live in the human world, but he hadn't realized the extent to which this lack of knowledge could reach. He originally thought that after she arrived, she could at least help out a little in the store, but he didn't expect that she didn't even recognize money.
But this was quite reasonable.
After all, she didn't need to spend money while lying in the coffin...
"Ah, while Sherry and Nina are not around, I might as well continue tutoring you," Duncan sighed, abandoning his plan to go out that afternoon, "First, I need to introduce you to the most basic things in the human world, like currency…"
He paused and sighed again, "Looks like I really need to start a literacy class for you and Sherry."