Here are two adverts for cornflakes: 750g box Normal price £1.98 Buy one box, get 2nd box half price 500g box Normal price £1.75 Buy one box, get one free Which is the cheapest way to buy 1500g of cornflakes, A: two 750g boxes B: three 500g boxes? b) How much does it cost to buy 1500g of cornflakes, if you use the cheapest way?​