Paul, a calendar year single taxpayer, has the following information for 2020: AGI $175,000 State income taxes 13,500 State sales tax 3,000 Real estate taxes 18,900 Gambling losses (gambling gains were $12,000) 6,800 Paul's allowable itemized deductions for 2020 are: a.$16,800. b.$39,200. c.$10,000. d.$42,200.