Popcorn, Drinks and Crisps

Magda and her friends go to the cinema. They buy 1 large tub of popcorn, 4 fizzy drinks and 10 packets of crisps.  The bill comes to £10.89.  Lena and her friends go to the cinema. They buy 1 large tub of popcorn, 3 fizzy drinks and 7 packets of crisps.  The bill comes to £8.64.  How much would it cost to buy 1 large tub of popcorn, 1 fizzy drink and 1 packet of crisps?