My nearest ATM offers $50 and $20 notes.
I like to get fifties and if I enter an amount not divisible by 20, I receive at least one $50 note.
ATMs in bigger branches have note in multiples of ten, twenty and fifty. Wanting to get a 50 today, I took out $110 and received four twenties and three tens.
Does that bank have a formula for which notes are delivered for which amounts up to (say) $300?