MATHS shopping and change

this week for maths we have been learning how to solve maths problems
about money and decimals numbers

Task despcription:for this task  i had to work with a friend. we had to choose who
would be the shop owner and who would be the customer.than we had to anwser some questions
like for example lets say i bought three things at the shop i have to add i up to see how much it cost and the shop owner has to think how much my change is.