Margo has $2,200 withheld from her wages for state income taxes during 2016. In March of 2016, she paid $400 in additional taxes for her 2015 state tax return. Her state income tax liability for 2016 is $2,700 and she pays the additional $500 when she files her 2016 state tax return in April of 2017. What amount should Margo deduct as an itemized deduction for state income taxes on her 2016 federal income tax return, assuming she elects to deduct state and local income taxes?