Chuck, a single taxpayer, earns $76,250 in taxable income and $10,900 in interest from an investment in City of Heflin bonds. (Use the U.S. tax rate schedule.)

Required:

1. If Chuck earns an additional $40,000 of taxable income, what is his marginal tax rate on this income?
2. What is his marginal rate if, instead, he had $40,000 of additional deductions?

(For all requirements, do not round intermediate calculations. Round percentage answers to 2 decimal places.)

a. Marginal tax rate- ______%

b. Marginal tax rate- ______%