In this lesson we calculate the medicare levy which is 2% of your taxable income, and add it to the income tax to get the total tax you have to pay. We then compare this to how much tax you've already paid (PAYG) which is usually given to you in the question to figure out how much your tax refund/tax debt is.
Taxation is covered as part of the Maths A curriculum in Queensland, Australia
Maths A: Tax lesson 4: Calculate Medicare Levy / Tax Refund