During 2018 , the Smiths and the Joneses both filed joint tax returns. For the tax year ended December 31, 2018, the Smiths' taxable income was $126,000, and the Jones had total taxable income of $63,000. 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 Joneses. b. Calculate and compare the ratio of the Smiths' to the Joneses' taxable income and the ratio of the Smiths' to the Joneses' taxes. What does this demonstrate about the federal income tax structure? a. Using the federal tax rates given in Table 1.2 for married couples filing joint returns, the taxes for the Smiths is $19,599. (Round to the nearest dollar.) The taxes for the Joneses is $7,179. (Round to the nearest dollar.) b. The ratio of the Smiths' to the Joneses' taxable income is 2.00 (Round to two decimal places.) The ratio of the Smiths' to the Joneses' taxes is decimal places.) (Round to two