My son is 12. He gets $15/week. He can either spend that on school lunches ($3/day) or make a lunch and keep the $$$.
So far he has just bought his lunch and keeps the change that is left. It is up to him to save or not. Ans to Q2 – the cost of lunch every day for school Q4 – No Q5 – Yes, moving the lawn, doing something extra (other then putting away clothes or keeping his room in a walkable condition).