By $45,000 net operating income increase (or net loss decrease) assuming that fixed costs do not change.
Calculation of increase in operating income if sales increase by $75,000.
Increase in operating income = Increase in sales x Contribution margin ratio =75,000 x 60% =$45,000
Thus, net operating income would increase by $45,000 if sales increase by $75,000.
With the increase in sales revenue, the fixed costs would not change and so the additional operating profit earned by the company would be equal to additional revenue of $75,000 multiplied by the contribution margin ratio of 60% which gives a contribution margin of $45,000 and since there would be no changes in fixed costs the additional operating income would be $45,000.
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