1.1.2 [related to the Economics in Practice on p. 425] Using the tax brackets and rates for 2014 on p. 425, compute the total tax for each of the following income levels for a single taxpayer. In each case, calculate average and marginal tax rates. Assume that in each case the taxpayer chooses the standard deduction and qualifies for a single exemption.

a. Gross income = $35,000

b. Gross income = $70,000

c. Gross income = $125,000

d. Gross income = $250,000