What is contribution margin when 400,000 units are sold? Units Produced and sold 390,000 Sales revenue $2,437,500 Variable manufacturing expense $585,000 Fixed manufacturing expense $266,000 Variable selling and administrative expense $565,500 Fixed selling and administrative expense $232,000 $789,000 net operating income O $1,320,000 O $1,650,000 O $1,180,000 O $822,000