21 e Question 21 (15 marks) t of Surfking Pty Ltd manufactures and sells three styles of surfboards: Sleek, Chic and Groovy. Annual manufacturing fixed costs are $990,000 and annual selling and administration fixed costs are $830,000. Surfking Pty Ltd currently sell 10000 surfboards per annum. Sleek Chic Groovy Sales mix in units 25% 35% 40% Selling price $400 $750 $900 Variable costs $250 $550 $600 Please note that you do not need to type $ or % symbols. 21a Calculate the unit contribution margin for each product type. Round to whole numbers. (3 marks)