Zippy Company has a product that it currently sells in the market for $30 per unit. Zippy has developed a new feature that, if added to the existing product, will allow Zippy to receive a price of $45 per unit. The total cost of adding this new feature is $39,000 and Zippy expects to sell 2500 units in the coming year. What is the net effect on next-year's operating income of adding the feature to the product? $1500 increase in operating income. $1500 decrease in operating income. $3500 decrease in operating income. $3000 increase in operating income. $2500 decrease in operating income.