Alan and Sara Winthrop are a married couple who file a joint income tax return. They have two children, and they have legitimate itemized deductions totaling $28,500. Their total income from wages is $290,800. Assume the following tax table is applicable: Married Couples Filing Joint Returns If Your Taxable Income Is Up to $19,750 $19,750-$80,250 You Pay This Amount on the Base of the Bracket $0.00 1,975.00 Plus This Percentage on Average Tax Rate at Top the Excess over the Base 10.0% 12.0 of Bracket 10.0% 11.5 YTT $80,250-$171,050 $171,050-$326,600 $326,600-$414,700 $414,700-$622,050 9,235.00 29,211.00 22.0 24.0 17.1 20.4 66,543.00 32.0 22.8 94,735.00 35.0 26.9 Over $622,050 167,307.50 37.0 37.0 What is their marginal tax rate?