Dudley's Automotive installs mufflers in cars. Each muffler has a standard for installation time of $0\mathrm{.}25$ direct labour hours. The standard direct labour hour rate is $$12\mathrm{.}50$ per hour. Dat relating to muffler installations for the month of July follows.

$\backslash$table$[[$Actual number of mufflers installed,$2,100],[$Actual direct labour hours worked,$500],[$Actual total direct labour cost,$$5,600$