In a certain country, income tax is assessed as follows. There is no tax on income up to $15000. Any income over $15000 is taxed at a rate of 15%, up to an income of $25000. Any income over $25000 is taxed at 20%.a) Sketch the graph of the tax rate R as a function of the income I.
b) How much tax is assessed on an income of $14,000? On $26,000?
c) Sketch the graph of the total assessed tax T as a function of the income I.