If you could please explain how you solved this problem it would help me understand. Thank you!

Net Income Planning Selected operating data for Oakbrook Company in four independent situations are shown below. Fill in the blanks for each independent situation. D Sales $325,000 $130,000 24 c. $ e. f. $ Variable expense $101,000 $4 a. g. b. $62,000 $48,200 $44,500 Fixed expense Net income (loss) before tax $15,000 $15,000 $28,800 $(5,500) Units sold 30,000 d. Unit contribution margin $5.20 $7.00 Contribution margin ratio h. 0.4