Miguel is a citizen of a country in which the marginal tax rates on income are as follows: Taxable income Marginal Tax Rate 0 - $5.000 5 percent $5.001 - $20,000 15 percent $21,000 and above 25 percent Miguel's taxable income is $50,000. Calculate Miguel's tax owed. Calculate Miguel's average tax rate. c. Is this tax rate structure proportional, progressive, or regressive? Briefly explain