Dropping Unprofitable Department Thomas Corporation has four departments, all of which appear to be profitable except department 4. Operating data for 2019 are as follows: Required a. Calculate the gross profit percentage for departments 13 combined and for department 4. Department 1-3 % Department 4% b. What effect would elimination of department 4 have had on total firm net income? (Ignore the effect of income tax.) The firm's net income would be: $