Aleutian Company produces two products: Rings and Dings. They are manufactured in two departments: Fabrication and Assembly. Data for the products and departments are listed below.

Product	Number of Units	Direct Labor Hours per Unit	Machine Hours per Unit
Rings	1,000	4	6
Dings	2,000	3	9

All of the machine hours take place in the Fabrication Department, which has estimated total factory overhead of $90,000. All of the labor hours take place in the Assembly Department, which has estimated total factory overhead of $105,000.

Aleutian Company uses the multiple production department factory overhead rate method. The Fabrication Department uses machine hours as an allocation base, and the Assembly Department uses direct labor hours.

The Assembly Department's factory overhead rate (rounded to the nearest cent) is

a.$10.50 per direct labor hour

b.$3.75 per machine hour

c.$4.38 per machine hour

d.$19.50 per direct labor hour