Confirm your calculations in Requirement 3 above by increasing the unit sales in your worksheet by 20% so that the Data area looks like this:

Unit sales 60,000 units
Selling price per unit 50 per unit
Variable expenses per 30 per unit
Fixed expenses 500,000

(a) What is net operating income? (Negative amount should be indicated by a minus sign.)
(b) By what percentage did the net operating income increase?