bob is having a party and wants to order cakes. There will be 57 guests and he wants everyone to get a slice of cake. he wants to pay as little as possible.


How much will he have to pay for the cakes?


1st cake is:


20cm cake.


Serves.

12 people

Cost

£13.50


2nd cake


25cm cake


Serves.

20 people

Cost

£18.75.


Please can somebody help me work this out.