1. Some students may be getting 'pocket money' from their parents (for taking care of their personal expenditure on travel,books etc). Such students can be asked to maintain their expenditure record in a spreadsheet on a computer (or in a diary).
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At the end of a month, the class can discuss the expenses incurred by the student.
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2. Discussing the household monthly expenditure of a family
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Students can do a project to identify the key expenses of their family/household over a month. They can present the expenditure in the form of a [https://help.libreoffice.org/Chart/Choosing_a_Chart_Type pie chart], using the LibreOffice calc - CHART function
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Video on creating a pie chart using a spreadsheet (the video uses 'number of staff by region', you could do it with 'amount of expenditure by account head'