Maintenance costs at a Straiton Corporation factory are listed below: Machine Hours Maintenance Cost March 3,627 $54,384 April 3,588 $53,980 May 3,637 $54,453 June 3,638 $54,491 July 3,572 $53,843 August 3,611 $54,196 September 3,644 $54,550 October 3,609 $54,181 November 3,669 $54,767 Management believes that maintenance cost is a mixed cost that depends on machine-hours. Using the high-low method to estimate the variable and fixed components of this cost, these estimates would be closest to: $0.10 per machine-hour; $54,382 per month $15.00 per machine-hour; $54,316 per month $9.12 per machine-hour; $21,309 per month $9.53 per machine-hour; $19,801 per month