What is contribution margin when 500,000 units are sold? Units Produced and sold 450,000 Sales revenue $2,812,500 Variable manufacturing expense $675,000 Fixed manufacturing expense $266,000 Variable selling and administrative expense $652,500 Fixed selling and administrative expense $232,000 net operating income $987,000 O $1.152,000 O $1,475,000 $1,650,000 $1,485,000