Diego, age 28, married Dolores, age 27, in 2015. Their salaries for the year amounted to $47,126 and they had interest income of $3,500. Diego and Dolores deductions for adjusted gross income amount to $2,000, their itemized deductions were $11,576, and they claimed two exemption on their return.

What is their tax liability for 2015? how to calculator?