To pay for his academic fees, Tarek, a college student, is selling a computer accessory to other students. His cost to purchase each piece is $ 65 65, and he is planning to sell the accessories for $ 104 $104 each. Fixed costs for advertising amount to $ 550 550. (a)Compute the contribution margin. (b)Compute the contribution rate. (c)Compute the break-even point in units. (d)Compute the break-even point in sales dollars. (a) The contribution margin per unit is $ nothing . (Type a whole number.) (b) The contribution rate is nothing %. (Round to two decimal places as needed.) (c) The break-even point in units is nothing . (Round up to the nearest unit.) (d) The break-even point in sales dollars is $ nothing . (Round to the nearest cent as needed.) Enter your answer in each of the answer boxes.