Sears is adding a new line of John Deere lawn mowers. The cost of each such lawn mower is $$321\mathrm{.}00$ with an operating cost of adding this line is estimated to be $40\%$ of the cost of each unit. If Sears matches the competition's retail price of $$649$ on each lawn mower, what will be the operating profit per unit?

Select one:

A$.$ $$128\mathrm{.}40$

B$.$ $$199\mathrm{.}60$

C$.$ $$259\mathrm{.}60$

D$.$ $$328$

E$.$ $$61\mathrm{.}40$