Data for Perry Sales are below Fixed costs are $10,000 per month and the company is selling 1,000 units per month. a) Complete the chart by calculating the variable costs per unit and contribution margin per unit. b) The marketing manager argues that an $8,000 increase in the monthly advertising budget would increase monthly sales by $12,000. Is it a good decision to increase the advertising budget? It is a (Select one) decision because operating income will (Select one) for the month by $ decision to use higher-quality components? It is a (Select one) decision because the contribution margin will (Select one) for the month by $