Answer:
d. $15,400
Explanation:
Sales (5,300 units) Â Â Â Â $296,800
Variable expenses     ($174,900)
Contribution margin    $121,900
Fixed expenses       ($106,500)
Net operating income  $15,400
Workings:
Sale Price per unit = $319,200 / 5,700 = $56
Variable cost per unit = $188,100 / 5,700 = $33
Total Sales = 5,300 x $56 = $296,800
Total Variable cost = 5,300 x $33 = $174,900