During 2015, the Smiths and the Jones both filed joint tax returns. For the tax year ended December 31, 2015, the Smiths' taxable income was $122,000, and the Jones had total taxable income of $61,000. a. Using the federal tax rates given in Table 1.2 for married couples filing joint returns, calculate the taxes for both the Smiths and the Jones. b. Calculate and compare the ratio of the Smiths' to the Jones' taxable income and the ratio of the Smiths' to the Jones' taxes. What does this demonstrate about the federal income tax structure? TABLE 1.2: Tax Rates and Income Brackets for Joint Returns (2015) Taxable Income Tax Rates Joint Returns 10% $0 to $18,150 $18,151 to $73,800 $73,801 to $148,850 $148,851 to $226,850 $226,851 to $405,100 $405,101 to $457,600 15% 25% 28% 33% 35% 39.6% Over $457,600