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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. Direct Labor Hours Machine Hours Number of Units Product per Unit per Unit Rings 980 5 7 Dings 2,500 3 9 All of the machine hours take place in the Fabrication Department, which has estimated total factory overhead of $86,300. All of the labor hours take place in the Assembly Department, which has estimated total factory overhead of $66,600. 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 is Oa. $5.37 per direct labor hour Ob. $5.49 per machine hour Oc. $2.75 per machine hour Od. $2.94 per direct labor hour