Manatau Company produces two types of surgical instruments, Basic Model and Advanced Model, which pass through two production departments, Fabrication and Assembly. The following data relate to the year just ended: Actual total overhead costs for the year were $675,000. Required: a. Calculate the predetermined plantwide overhead rate based on direct labour hour. b. Calculate the per unit cost of the Basic Model and Advanced Model, based on plantwide overhead rate assuming that direct labour hour is the cost driver. c. Calculate the predetermined departmental overhead rates, assuming that machine hour is the cost driver in Fabrication and direct labour hour is the cost driver in Assembly. d. Calculate the per unit cost of the Basic Model and Advanced Model, based on the departmental overhead rates. e. Indicate and calculate the amount of underapplied or overapplied overhead using plantwide overhead rate. f. Indicate and calculate the amount of underapplied or overapplied overhead using departmental overhead rates