The following standards for variable manufacturing overhead have been established for a company that makes only one product:

Standard Hrs per unit of output - 5.6Hrs

Standard Variable OH Rate - $12 per hour

The following data pertain to operations for the last month:

Actual hours = 2,600 hrs.

Actual Total variable manufacturing OH cost = $31,330

Actual output = 400 units

What is the variable overhead rate variance for the month?

A)$4,450 U B) $4,338 U C) $112 F D) $130 U

I could solve till here, but couldn't understand what to do next -

Since, the Standard hours per unit of output - 5.6 hours

Standard Variable OH Rate - $12 per hour

Actual hours = 2,600 hrs.

Actual output = 400 units

To calculate the variable overhead efficiency variance -

(Standard Quantity - Actual Quantity) * Standard rate