The sales manager is convinced a 12% reduction in the selling price, combined with a $67,000 increase in advertising, would increase this year's unit sales by 25%. If the sales manager's ideas are implemented, how much will net operating income increase or decrease over last year? Note: Negative amounts should be input with a minus sign. The sales manager is convinced a 12% reduction in the selling price, combined with a $67,000 increase in advertising, would increase this year's unit sales by 25%. If the sales manager's ideas are implemented, how much will net operating income increase or decrease over last year? Note: Negative amounts should be input with a minus sign