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Sarah also needs to work out how much ribbon is required.
She uses the expression
4h + 2d + 2w + 30
Look at the picture of the box.
The ribbon runs along four heights, two depths and two widths.
The ribbon also has to be tied into a bow. This always takes 30 cm of ribbon whatever the size of the box.
1. Explain how Sarah has worked this out. Why is 30 added to the expression?
Back AnswerMore
Sarah needs a formula to calculate the total cost of the box.Use c to stand for the cost of 1 cm2 of card. Use r to stand for the cost of 1 cm of ribbon.
Use your formula to work out the cost of a box.
Set up a spreadsheet to work out the cost of any box.