Martin Lewis has worked out a secret formula to work out how much extra a parent should pay if their child is studying at home instead of going to university.The MoneySaving expert detailed his calculation when answering a viewer's question on the latest The Martin Lewis Money Show on ITV.Mum-of-two Marianne had asked how much parents should charge their children, but Martin instead explained his "formula" that explains the extra amount of money parents should be contributing during term time.He said: "When your child goes to university, they get a maintenance loan, and that is based on family income, which for most under 25s, is a proxy for parental income."Now in my view between the full loan they get, the full loan or grant in Scotland,.
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