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:

$\backslash$table$[[,,,$Mountain,$],[$Sales$,$Total,Dirt Bikes,,Racing Bikes$],[$Variable manufacturing and selling expenses,$$922,000,$$$268,000,$$$401,000,$$$253,000$