Selected operating data for Venora Company in four independent situations are shown below. Fill in the blanks for each independent situation A B Sales $390,000 $210,000 Oe. Variable expense 0 f. $ $55,000 0 g. Oa. $ Fixed expense 0b $56,000 $240,000 $90,000 Net income before tax (loss) $47,000 $16,000 $117,000 $(6,000) 0 d Units sold 7,000 Unit contribution margin $20 $9 0 h Contribution margin ratio 0.7