Victory Tire Company makes a special kind of racing tire. Variable costs are $210 per unit, and fixed costs are $10,000 per month Victory sells 500 units per month at a sales price of $310. If the quality of the tire is upgraded, the company believes it can increase the sales price to $350. If so, the variable cost will increase to $240 per unit, and the fixed costs will remain the same. If Victory decides to upgrade, how will it affect operating income? O A. Operating income will decrease by $5,000 OB. Operating income will increase by $5,000 OC. Operating income will decrease by $15,000 OD. Operating income will increase by $15,000