Staley Co. manufactures computer monitors. The following is a summary of its revenue data: basic cot an 7. Per Unit Percent Sales price Variable costs Unit contribution margin $480 312 S168 65 35 month and monthly fixed Assume that Staley Co. is currently selling 600 computer monitors per costs are $80,000. If an $18,000 increase in the advertising budget would increase monthly sales by $60,000, the new level of operating income (Ta) for Staley Co. would be: A $19,800 B $21,800 $24,800 D. $23,800. E $20,800