Tony buys 4kg of potatoes at £1.60 per kilogram and 2kg of onions at £1.80 per kilogram.
She pays with a £20 note.
How much change should she receive?
4kg of potatoes at £1.60 = 4 x 1.60 = 6.40
2kg of onions at £1.80 = 2 x 1.80 = 3.60
4kg of potatoes + 2kg of onions = 6.40 + 3.60 = 10
£20 - £10 = £10
How much change should she receive? £10