11) The "ABM" Company sells pencil cases for $12 each. Manufacturing cost is $3.60 per pencil case; marketing costs are $1.60 per pencil case; and royalty payments are 20% of the selling price. The fixed cost of preparing the pencil cases is $18 000. Capacity is 15 000 pencil cases. a) Compute the unit contribution margin and contribution rate. (2 marks) b) Compute the break-even point in units (2 marks) c) Determine the break-even point in units if fixed costs are increased by 20%. (2 marks) d) Determine the break-even point in units if the selling price is increased by 30%, while fixed costs are increased by 20%. (2 marks)