The following are monthly totals taken from the log of laser printer used by the Hardcopy Printing International. Cost was based on a flat fee plus a declining cost per copy made after a minimum number of coples had been made each month. Month Number of Copies Made Total Cost July 38,720 $11,880 August 33,440 10,560 September 36,190 11,248 October 44,330 13,283 November 42.240 12,760 December 53,790 15,648 To differentiate the variable and fixed costs in the use of this machine for future planning, use the high-low method to (a) determine the variable cost per copy (round your answers to two decimal places) and (b) compute the fixed and variable costs for either the month of August or December (round your answers to nearest whole number)