Ms. P is considering investing $20,000 in a new business. She projects that this investment should generate an additional $3,000 of income each year. In estimating her tax on this future income stream, should Ms. P use her marginal tax rate or her average tax rate? Country M levies a 10 percent excise tax on the retail price of any automobile purchased in the country. This year, the aggregate purchase price subject to tax was $8 million, so current year revenue was $800,000. Country M plans to increase the tax rate next year to 11 percent. Compute next year's excise tax revenue assuming: a. Next year's tax base equals the current tax base. b. Next year's tax base equals increases to $9.3 million. c. Next year's tax base equals decreases to $7 million