TM Ltd. currently manufactures Part XMB, which is used in one of its products. At its production level of 3227 units, the unit product cost of Part XMB is as follows: Direct labour $9 Direct materials 5 Manufacturing overhead (35% is variable) 18 A supplier, Tam Co., has offered to sell TM Ltd. 3227 units of Part XMB for $24 a unit. TM Ltd. has determined that if it purchases the part externally, all costs will be avoidable with the exception of three quarters of the fixed manufacturing overhead. In determining whether to accept Tam Co.s offer, what are the relevant costs to TM of manufacturing the parts internally (cost to make)?