Penn Corporation has four departments, all of which appear to be profitable except department 4. Operating data for 2019 are as follows: Total Departments 1-3 Department 4 Sales $1.580,000 $1,340,000 $240,000 Cost of sales 920,800 750,400 170,400 Gross profit 659,200 589,600 69,600 Direct expenses $177,000 $150,000 $27,000 Common expenses 201,200 150,600 50,600 Total expenses 378,200 300,600 77,600 Net income (Loss) $281,000 $289,000 $(8,000 a. Calculate the gross profit percentage for departments 1-3 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: $