When we were foster parents, teens were expected to give us 1/3 and they got to keep the rest.

I personally would have flipped it the other way around, or had a requirement that another 1/3 went into savings.

If our teens didn't get centrelink, then they got $15 pocket money a week, plus we'd let them buy something "fun" (up to $10) at the shop if they came and helped with the shopping (could be food, a magazine, cheapie mascara, etc).

So a big difference if they didn't get centrelink! Their centrelink was $270 a fortnight. They were "boarding/lodging" with us, so weren't eligible for rent assistance.

But all their food (not junk or soft drink - just general meals and healthy snacks), schooling, and basic clothes, school books etc were paid for.