AA maximum Ltd. manufactures bicycles. Two types of bicycles produced are BWB100 and CSX300. The following data relates to the products.

	BWB100	CSX300
Selling price per unit	$560	$850
Direct material	$120	$160
Direct labour	$225	$450
Variable overhead	$12	$15
Variable selling costs	$5	$8
Total variable cost/unit	$362	$633

Highly skilled staff are required to manufacture the bicycles and this is in short supply, thus considered to be a scarce resource. It takes 3 labour hours to produce one BWB100 and 6 labour hours to produce one CSX300.

What is the total contribution margin at the optimal level?