the following tax proposal has income as the tax base. calculate the marginal tax rate for an income of $5,000 and an income of $40,000. then, calculate the percentage of income paid in taxes for an individual with a pre‐tax income of $5,000 and for an individual with a pre‐tax income of $40,000. classify the tax as being proportional, progressive, or regressive. round answers to two places after the decimal, where applicable. tax proposal: all income between $0 and $10,000 is taxed at 10%. all income between $10,000 and $20,000 is taxed at 20%. all income higher than $20,000 is taxed at 30%.