Net Income Planning Selected operating data for Oakbrook Company in four independent situations are shown below. Fill in the blanks for each independent situation. $350,000 O $ a. Sales Variable expense Fixed expense Net income (loss) before tax Units sold Unit contribution margin Contribution margin ratio 0 C. $ $111,000 $ $62,000 $15,000 O d. $7.00 0e 0 f. $ $53,200 $28,800 O b. $520,000 0 g. $178,000 $(22,000) $25,000 30,000 $5.20 0.4 0 h