Herbert Company gathered the following information on its mixed power costs and factory machine usage for the last four months: Month Power Costs Factory Machine Hours January $ 24,400 13,900 February $ 30,000 17,000 March $29,000 16,800 April $ 14,000 7,000 If it is estimated that 10,000 factory machine hours will be used in the month of May, what is the expected total power costs for May? $18,800 $15,875 O $18,586 None of the above