Im looking to change the way i price i am asking what do people around our area think would be the best way?

How much it costs me then add my time on top?e.g. a cut and blow-dry costing me say £5 then adding my time each hour valued at £5 = £10 = Personalised for every hair i do Invoiced to show the client exactly how they are billed. (Not Real Figures)

To use a set price list like how hairdressers have worked for years?