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 $26,000. Their total income from wages is $172,700. Assume the following tax table is applicable: Married Couples Filing Joint Returns If Your Taxable Income Is You Pay This Amount on the Base of the Bracket Plus This Percentage on the Excess over the Base Average Tax Rate at Top of Bracket Up to $19,750 $0.00 10.0% 10.0% $19,750-$80,250 1,975.00 12.0 11.5 $80,250-$171,050 9,235.00 22.0 17.1 $171,050-$326,600 29,211.00 24.0 20.4 $326,600-$414,700 66,543.00 32.0 22.8 $414,700-$622,050 94,735.00 35.0 26.9 Over $622,050 167,307.50 37.0 37.0 What is their marginal tax rate?