A tax system has the following income tax brackets: $0 to $20,000, 10%; $20,001 to $40,000, 15%; $40,001 to $60,000, 20%; and over $60,000, 25%. Calculate the effective tax rate and marginal tax rate for both of these individuals: Tom makes $90,000 and has $10,000 in itemized deductions and $3,500 in a personal exemption. John makes $35,000 and has $5,900 in the standard deduction and a $3,500 personal exemption. Based on your calculations for these individuals, is the tax system regressive, progressive or proportional? Why?