19. Willco Inc. manufactures electronic parts. They are analyzing their monthly maintenance costs to determine the best way to budget these costs in the future. They have collected the following data for the last six months: Using the high-low method and the Willco data, calculate the variable maintenance cost per machine hour (round to three decimal places). A. $1.016/hr. B. $0.976/hr. C. $1.863/hr. D. $1.250/hr. E. $0.907/hr.