Stone Age Surfboards is a small manufacturer of two types of popular low$-$tide surfboards, the Graystone and the Lava models. The manufacturing process consists of two departments: fabrication and finishing. The fabrication department has $8$ skilled workers, each of whom works $9\mathrm{.}25$ hours per day. The finishing department has $5$ workers, each of whom works a $6-$hour shift per day. Each pair of Graystone surfboards requires $2\mathrm{.}5$ labor hours in the fabrication department and $2$ labor hours in finishing. The Lava model requires $4\mathrm{.}2$ labor$-$hours in fabrication and $3\mathrm{.}6$ labor$-$hours in finishing. The company operates $6$ days a week. It makes a per unit profit of $$40$ on the Graystone model and $$60$ on the Lava model. The company anticipates selling at least twice as many Lava models as Graystone models. If the unit profit on Graystone surfboards is increased by $$10,$ what is the total profit generated? Round to the nearest cent.

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A$.$ $$554\mathrm{.}35$

B$.$ $$423\mathrm{.}91$

C$.$ $$521\mathrm{.}74$

D$.$ $$489\mathrm{.}13$

$\backslash$table$[[,$A$,$B$,$C$,],[1,$Stone Age Surfboards,D$,,],[2,,,,],[3,$Data,Product,$],[4,,$Graystone,Lava,Limitation $($hours$)],[5,$Department,$2\mathrm{.}5,4\mathrm{.}2,74],[6,$Fabrication,$2,3\mathrm{.}6,30],[7,$Finishing,,,$],[8,,$$$40\mathrm{.}00,$$$60\mathrm{.}00,],[9,$Profit$/$Unit$,,,],[10,,,,],[11,,$Graystone,Lava,$],[12,$Model,,,Hours Used$],[13,,,,],[14,$Quantity Produced,,,$],[15,$Fabrication,,,$],[16,$Finishino,,,$]]$