42. Havel and Petra are married and will file a joint tax return. Havel has W-2 income of $45,588, and Petra has W-2 income of $47,229. What is their tax liability? Determine their tax liability using both the tax tables and the tax rate schedule. 42. Havel and Petra are married and will file a joint tax return. Havel has W-2 income of $45,588, and Petra has W-2 income of $47,229. What is their tax liability? Determine their tax liability using both the tax tables and the tax rate schedule