Waterford Corporation allocates overhead to products on the basis of machine hours. In the current month. 1.800 machine-hours were allowed for the actual number of units produced. The company's standard variable overhead application rate is $12 per machine hour, and its standard foxed manufacturing overhead allowed per month is $9.400 During the month, the company actually spent a total of $28,500 on overhead, of which $10,000 were fixed cost expenditures The company's overhead spending variance was $ favorable/unfavorable)