The graph shows tax payable against taxable income, in thousands of dollars.
- Use the graph to find the tax payable on a taxable income of $21 000. (1 mark)
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- Use suitable points from the graph to show that the gradient of the section of the graph marked `A` is `1/3`. (1 mark)
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- How much of each dollar earned between $21 000 and $39 000 is payable in tax? (1 mark)
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- Write an equation that could be used to calculate the tax payable, `T`, in terms of the taxable income, `I`, for taxable incomes between $21 000 and $39 000. (2 marks)
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