Fulton and Sons, Inc. presently leases a copy machine under an agreement that calls for a fixed fee each month and a charge for each copy made. Fulton made $6,000$ copies and paid a total of $$570$ in March; in May, the firm paid $$440$ for $4,000$ copies. The company uses the high$-$low method to analyze costs.

Fulton$$s variable cost per copy is: $($Round your final answer to $3$ decimal places.$)$

A$.$$$0\mathrm{.}078.$

B$.$ $$0\mathrm{.}081.$

C$.$ None of the answers is correct.

D$.$ $$0\mathrm{.}065.$

E$.$ $$0\mathrm{.}076.$