Bolka Corporation, a merchandising company, reported the following results for October: Sales $ 407,000 Cost of goods sold (all variable) $ 173,400 Total variable selling expense $ 20,400 Total fixed selling expense $ 22,200 Total variable administrative expense $ 14,800 Total fixed administrative expense $ 39,700 The contribution margin for October is: Multiple Choice $198,400 $233,600 $136,500 $345,100