Ramapo Company produces two products, Blinks and Dinks. They are manufactured in two departments, Fabrication and Assembly. Data for the products and departments are listed below. Number of Direct Labor Hours Machine Hours Units Per Unit Per Unit Product Blinks 948 3 5 Dinks 2,253 6 All of the machine hours take place in the Fabrication department, which has an estimated overhead of $92,400. All of the labor hours take place in the Assembly department, which has an estimated total overhead of $81,500. Ramapo Company uses a single plantwide overhead rate to apply all factory overhead costs. The single plantwide rate, if it is based on machine hours instead of labor hours, is Oa. $21.91 per machine hour Ob. $9.52 per machine hour Oc. $11.91 per machine hour Od. $7.62 per machine hour