Engineering Economy 7th Edition by Leland Blank ,Anthony Tarquin

Exercise 28

Last year, one division of Hagauer.com, a dot-com sports industry service firm that provides real-time analysis of mechanical stress due to athlete injury, had $250,000 in taxable income. This year, TI is estimated to be $600,000. Calculate the federal income taxes and answer the following.
a) What was the average federal tax rate paid last year
b) What is the marginal federal tax rate on the additional TI this year
c) What will be the average federal tax rate this year
d) What will be the NOPAT on just the additional $350,000 in taxable income