How much would you expect a 15/16 year old to charge for babysitting?

Minimum wage is for employees not self employed people. Babysitting is a self employed thing because it's sporadic, you can say no if you don't want to do it, you set the rate yourself and someone else could take your place babysitting (for example if you couldn't do it you might suggest your sister or friend could do it). I'm a self employed childminder which is different to babysitting obviously as I'm registered and have to train and the children come to my house but I can assure you that some days I don't make the minimum wage and some days I make more than minimum wage. When I do my tax return and all my expenses, the wage for my assistant etc comes off and I split the profit into the hours I've done for the year, it's no where near minimum wage but I don't have to pay for childcare for my own child so it balances out for our household that I'm still earning an 'ok' wage.