Will I pay less if I buy more?

image designed by macrovector / Freepik

This activity can be used in a large range of grade levels.  Your class can work on percents, linear equations or piecewise functions.

Act One: We missed the semi-annual sale but we want to get ready for the next one.  Let's figure out how much we could save. What questions do you have (see the picture in the activity)?

       Act Two:  What amounts make sense to spend up to get the best deal?  What purchase amounts do not make sense to make?

Note to teachers: In this sale, if you spend $75 you get 25% off, but if you spend $25 more, getting up to $100, you save 30%.  If you spend $124 you also get 30% off.  Anything $125 or more is 40% off.

       Create a graph with the value of your purchase on the x -axis (before this discount) and what you actually pay on the y-axis (after discount).  How        does this graph help you see which price points are the best deal?

For Adventurer members we have an editable word docx, our Excel files & our solutions.

    Act Three:  A great way to sum up the lesson is to ask kids ... "if you are going to buy $74 worth of clothes then you might as well buy $______ worth of clothes."