Selected operating data for Oakbrook Company in four independent situations are shown below. Fill in the blanks for each independent situation. A B C D Sales $300,000 Answer c. Answer e. $260,000 Variable expense Answer a. $91,000 Answer f. Answer g. Fixed expense Answer b. $62,000 $43,200 $89,000 Net income (loss) before tax $20,000 $15,000 $28,800 $(11,000) Units sold 30,000 Answer d. Unit contribution margin $5.20 $7.00 Contribution margin ratio 0.4 Answer h