Question Completion Status: Sam and Laverne, a married couple ning a joint tax retum, had taxable income of $145,000 for 2021. They have four dependents their three children, ages 5, 16 and 17, and Sam's mother, age 68. a. Show the calculation of their 2021 Federal income tax. b. Show the calculation of any available child tax credits and depedent tax credits. You can ignore any income phaseout for the credits. c. What is their net tax due after the credits ? d. What is their average or effective tax rate based on the net tax due in part ? e. What is their marginal tax rate? For the toolbar, press ALT 10 (PC) O ALT+FN+F10 (Mac). B I US Paragraph Arial 10pt A T. X 0 G Q5 x X, TT 11 15 ES