Teenagers and pocket money

[CharliesRedSock]

Just wondering what others do about their teenagers and pocket money.
Dd constantly seems to want need money and I am beginning to feel like a cash machine! She gets £20/month from her Grandma. Do you give a set amount of money per month and what things do you not expect them to have to pay for/do expect them to pay for? I think we need to set up some firmer boundaries.

15yo gets 40quid a month. I pay phone, music lessons/sport subscriptions/kit. He pays everything else - any travel, cinema tickets, food with friends. He gets the odd extra tenner here and there if we are out and doing stuff. I pay school uniform and shoes (and when he has grown out of clothes) but if he wants additional clothes - like a tshirt for a gig or cinema trip) then it is his buy or we might negotiate percentage split depending on the cost /state of his bedroom /contribution around the house. He has to empty dishwasher after school every day, push Hoover around and collect younger sibling twice a week. It's made him responsible-ish. Impulse buying of crap is much reduced from when he would ask for money adhoc. He has a debit card and the dosh is paid monthly. And he's quite generous, he thinks I don't know that he takes little brother for ice cream on those twice weekly pick ups!