Patricia has taxable income of $40,000 on which she pays income tax of $5,935. If Patricias taxable income increases by $2,000, she will pay an additional tax of $500. What is Patricias marginal tax rate?

a.	15.00 percent
b.	14.84 percent
c.	15.32 percent
d.	25.00 percent
e.	None of the above