ABC Company's single product has a selling price of $15 per unit. Last year, the company reported total variable expenses of $180.000, fixed expenses of $90,000, and an operating income of $30,000. A study by the sales manager discloses that a 15% increase in the selling price would reduce unit sales by 10% If her proposal is adopted, would the operating income increase or decrease ? please type I for increase and D for decrease If her proposal is adopted, what dollar amount would the operating income change by? $