20% of a liter is $0.25 -- There are cases when you're traveling/camping that you may have used 20% of your 1L can but need to refill it for the next leg of cam

20% of a liter is $0.25 -- There are cases when you're traveling/camping that you may have used 20% of your 1L can but need to refill it for the next leg of camping. If I was buying $0.25 of gasoline I'd be slightly weird about it too, at least to acknowledge / show awareness that the situation is indeed strange. Doing it in the same non-plussed manner as I buy $20 of gas would seem more awkward to me than adding in a touch of bashfulness. Adding additional social cues that something is unique about the transaction can also head off clerical errors like processing my request as "oh he clearly meant $25, not 25 cents".