Wildhorse Co. gathered the following information on power costs and factory machine usage for the last six months: Month Power Cost Factory Machine Hours January $29,020 16.100 February 36,980 22.000 March 33,510 19.000 April 26,850 15.400 May 24,520 13.800 June 21,300 10.800 Using the high-low method of analyzing costs. answer the following questions and show computations to support your answers. (a) What is the estimated variable portion of power costs per factory machine hour? (Round answer to 2decimal places, 83.15.25.) Variable power costs $ per factory machine hour