Suppose in Fiscalville there is no tax on the first $10,000 of income, but there is a 20 percent tax on earnings between $10,000 and $20,000 and a 30 percent tax on income between $20,000 and $30,000. Any income above $30,000 is taxed at 40 percent. Instructions: Enter your answers as a whole number. a. If your income is $50,000, how much will you pay in taxes? $ b. Determine your marginal tax rate. percent c. Determine your average tax rate. percent d. Is Fiscalville's income tax progressive? (Click to select) V