the regal cycle company manufactures three types of bicycles—a dirt bike, a mountain bike, and a racing bike. data on sales and expenses for the past quarter follow: total dirt bikes mountain bikes racing bikes sales $ 922,000 $ 265,000 $ 402,000 $ 255,000 variable manufacturing and selling expenses 472,000 115,000 206,000 151,000 contribution margin 450,000 150,000 196,000 104,000 fixed expenses: advertising, traceable 69,000 8,400 40,300 20,300 depreciation of special equipment 44,300 20,700 8,000 15,600 salaries of product-line managers 114,100 40,400 38,500 35,200 allocated common fixed expenses* 184,400 53,000 80,400 51,000 total fixed expenses 411,800 122,500 167,200 122,100 net operating income (loss) $ 38,200 $ 27,500 $ 28,800 $ (18,100)