Merrimack Tire Company makes a special kind of racing tire. Variable costs are $210 per unit, and fixed costs are $35,000 per month. Merrimack sells 400 units per month at a sales price of $310. If the quality of the tire is upgraded, the company believes it can increase the price to $330. If so, the variable cost will increase to $220 per unit, and the fixed costs will rise by 20%. If Merrimack decides to upgrade, how will operating income be affected? OA. Operating income will increase by O B. Operating income will decrease by $3,000. O C. Operating income will decrease by $8,000 O D. Operating income will increase by $8,000