This task introduces students to exponential growth and decay. It relates to compound interest for savings and depreciation of assets (e.g. cars).
Number and Measure, Financial Maths, Algebra and Graphs
An appreciation of percentages is required.
Suitable for class discussion to introduce exponential growth and decay. The task would then be suitable for small group or individual work, according to students’ preferences.
Spreadsheet for modelling; graphing software/Geogebra/calculator
For related work, see the Core Maths Masters Subject Support, Strand: Graphs, Units 4 and 5. Possibly link with Cormathzadrine task for a further example of exponential decay.
Developed by Tom Carpenter at Bishop Challoner Catholic College.