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b) d) What is KTI's contribution margin per lineal foot of shelving? (3 marks) What is KTI's expected contribution margin per foot of mantels? (3 marks) What is the optimal production/sales plan? (How many lineal feet of mantels and how many lineal feet of shelving?) (8 marks) The only person Karl trusts is his twin sister, Karla; she is a manager and designer. Karl is considering hiring Karla to assist him in supervising, designing and selling products. How much would Karl be willing to pay Karla for her assistance? ( 4 marks)