Jilk Inc.'s contribution margin ratio is 60% and its fixed monthly expenses are $51,000. Assuming that the fixed monthly expenses do not change, what is the best estimate of the company's net operating Income in a month when sales are $144,000? Multiple Choice 586,400 58, 535,400 $93,000 Serfass Corporation's contribution format Income statement for July appears below. Sales $369,000 Variable expenses 147, 600 Contribution margin 221,400 Fixed expenses 55, 350 Net operating income $166,050 The degree of operating leverage is closest to: Multiple Choice O 0.45 0 0 0 133