Task
You are in a restaurant and you are observing the following
dialog:
Customer 1 (to waiter) Can I have a bill please?
Customer 2 (to waiter) Can I have a bill please?
Waiter (to Customer1) It is £24.56.
Customer 1 (to waiter) Here you are. I am paying by Master
Card.
Waiter (to Customer 2) It is  £35.34.
Customer 2 (to waiter) Can you arrange home delivery?
Waiter (to Customer 2) Yes, it costs £ 5.00 extra. In total it is
£40.34.
Customer 2 (to waiter) Here you are. I am paying by Switch
card.
Customer 2 (Customer 1) Home delivery is very expensive
here, don’t you think so?