Fuller Company allocates manufacturing overhead based on machine hours. Each bike produced should require $4$ machine hours. According to the static budget, the following is expected to incur:

$2,200$ machine hours per month $(550$ bikes x $4$ hours per bike$)$

$$11,440$ in variable manufacturing overhead costs

$$9,400$ in fixed manufacturing overhead costs

During January, Fuller Company actually used $2,100$ machine hours to make $510$ bikes. The company spent $$6,800$ in variable manufacturing overhead costs and $$9,100$ in fixed manufacturing overhead costs.

What is the variable manufacturing overhead allocation rate $($to the nearest cent$)?$

$$5\mathrm{.}00$ per machine hour

$$6\mathrm{.}75$ per machine hour

$$4\mathrm{.}83$ per machine hour

$$5\mathrm{.}20$ per machine hour

IDON'T KNOWYET