Calculate Devin and Andreas 2021 tax liability after credits based on the following. What is their average tax rate? SHOW YOUR WORK! Devin and Andrea are married and filing jointly. They have three children, son Mark (age 10), son Keith (age 5) and adopted daughter Lisa (age 3). During the year, Andrea earns a salary of $180,000. They also have qualified dividend income of $6,000 from various stock holdings and interest income from a municipal bond of $800. They are taking the standard deduction