Dropping Unprofitable Department Penn Corporstion h four deeparmenti. all of whichannaua co be profitable except departinent 4. Operating data for 2019 are as folows: a. Calcume the gross profit perkentage for departments 13 combined and for degariment 4 : Departmere 1-3 Department at a. What effect would elmiration af departawent 4 hwe had on total firm net income? (lgnore the effect of income tio.) The firms' net income would be