Royall Control Company, which manufactures electrical switches, uses a standard cost system in which manufacturing overhead costs are applied to units of product on the basis of machine hours (MHs). Budgeted machine hours per month is 300,000 hours. The standard overhead costs are shown below: The following information is available for the month of October: Compute the production volume variance for October. Indicate if it is favorable (F) or unfavorable (U). Example of Answer: 4000U 4000F (No comma, space, decimal point, or $ sign) Answer: 390000F