Oriole Co. gathered the following information on power costs and factory machine usage for the last six months: Month Power Cost Factory Machine Hours January $27,760 15,500 February 35,152 20,800 March 32,280 18,400 April 25,620 14,800 May 23,260 13,200 June 20,100 10,200 Using the high-low method of analyzing costs, answer the following questions and show computations to support your answers. What is the estimated variable portion of power costs per factory machine hour? (Round answer to 2 decimal places, eg. 15.25.) Variable power costs $ per factory machine hour