Carla Vista Trivia Co$.$ manufactures and sells two trivia products, the Square Trivia Game and the Round Trivia Game. Last quarter's operating profits, by product, and for the company as a whole, were as follows:

$\backslash$table$[[,$Square,Round,Total,$],[$Sales revenue,$$14,200,$$$6,950,$$$21,150,],[$Variable expenses,$4,990,2,990,7,980,],[$Contribution margin,$9,210,,3,960,13,170],[$Fixed expenses,$2,770,4,200,,6,970],[$Operating income,$$6,440,,$$$(240),$$$6,200$