Ellis McCormick and Elaine Sury are owners of MeetingKeeper, a company that sells personalized daily planners. Last month, the company sold 1,500 planners at a price of $6 per planner. Variable costs were $2.40 per unit; fixed expenses were $3,600. This month, Ellis and Elaine have decided to spend $2,000 to advertise in the local newspaper. They believe that the additional advertising will generate 25% more sales volume than last month. What will be this month's operating income? 

(a)$3,150 

(b)$1,150 

(c)$775 

(d)($1,100)