Exchange rates are skewed right now; the JPY is at something like a 30-year low. Putting numbers like those will date your work.
Historically, it's more like 90–120 JPY to 1 USD. And to keep things simple, most people just move the decimal separator over a couple places (i.e., 100 JPY to 1.00 USD).
^ Yeah, which is why I didn't want to convert the amount on the text of the bubbles. I figured I could save some people a Google search with a note, but it backfired comically.