Ramapo Company produces two products, Blinks and Dinks. They are manufactured in two departments, Fabrication and Assembly. Data for the products and departments are as follows:

$\backslash$table$[[$Product$,\backslash$table$[[$Number of$],[$Units$]],\backslash$table$[[$Direct Labor Hours$],[$Per Unit$]],\backslash$table$[[$Machine Hours$],[$Per Unit$]]],[$Blinks$,990,3,8],[$Dinks$,2,230,4,6]]$

All of the machine hours take place in the Fabrication department, which has an estimated overhead of $$117,300.$ All of the labor hours take place in the Assembly department, which has an estimated total overhead of $$77,200.$

Ramapo Company uses a single plantwide overhead rate to apply all factory overhead costs. The single plantwide rate $($rounded to the nearest cent$),$ if it is based on machine hours instead of labor hours, is

a$.$ $$11\mathrm{.}41$ per machine hour

b$.$ $$21\mathrm{.}00$ per machine hour

c$.$ $$9\mathrm{.}13$ per machine hour

d$.$ $$7\mathrm{.}31$ per machine hour