Ann's average income tax rate is 20%, and her marginal income tax rate is 30%. Her property tax bill for 2015 was $12,000 and her total interest payment on her mortgage was $7997. Based on this information, what is Ann's total income tax shield (i.e. how much is Ann saving on her income taxes, in dollars)? State your answer as a number rounded to two decimal points (e.g. if you get $4500.876, write 4500.88 )