Sarah wants to buy 8 jars of jam for the cheapest possible price. Shop A and Shop B both have a special offer.
20% off the normal price of £2.50\pounds 2.50£2.50
£3.00 \pounds 3.00\,£3.00 each Buy 3 get 1 free
Which shop should Sarah buy the jam from? You must show how you get your answer.
