Victory Tire Company makes a special kind of racing tire. Variable costs are $ $220$ per$$ unit, and fixed costs are $ $20000$ per month. Victory sells $500$ units per month at a sales price of $ $310.$ If the quality of the tire is$$ upgraded, the company believes it can increase the sales price to $ $350.$ If$$ so$,$ the variable cost will increase to $ $230$ per$$ unit, and the fixed costs will remain the same. If Victory decides to$$ upgrade, how will it affect operating$$ income?

A$.$

Operating income will increase by $ $5000.$

B$.$

Operating income will increase by $ $15000.$

C$.$

Operating income will decrease by $ $5000.$

D$.$

Operating income will decrease by $ $15000.$