7. Marginal tax rates [extra credit, 1 point each). Calculate the amount of total additional taxes, assuming: a. Pre-tax income increases from $287,000 to $311,000 b. Pre-tax income increases from $898,000 to $923,000. c. Pre-tax income increases from $4,890,000 to $5,070,000. d. Pre-tax income increases from $350,000 to $430,000. Pre-tax income increases from $3,500,000 to $3,900,000. 7. Marginal tax rates [extra credit, 1 point each). Calculate the amount of total additional taxes, assuming: a. Pre-tax income increases from $287,000 to $311,000 b. Pre-tax income increases from $898,000 to $923,000. c. Pre-tax income increases from $4,890,000 to $5,070,000. d. Pre-tax income increases from $350,000 to $430,000. Pre-tax income increases from $3,500,000 to $3,900,000