A county wants to build one centrally$-$located processing facility to serve the county's four recycling drop$-$off locations. The four drop$-$offs have characteristics as given in the table below. What is the approximate center of gravity of these four locations? $($Round answer to two decimal places.$)$

$\backslash$table$[[$Location$,$X$-$coordinate,Y$-$coordinate,Tonnage$],[$Drop$-$off point A$,5,7,260],[$Drop$-$off point B$,8,10,30],[$Drop$-$off point C$,21,7,20],[$Drop$-$off point D$,7,5,30]]$

A$.(2,170\mathrm{.}00,2,410\mathrm{.}00)$

B$.(8\mathrm{.}75,8\mathrm{.}75)$

C$.(6\mathrm{.}38,7\mathrm{.}09)$

D$.(8\mathrm{.}00,10\mathrm{.}00)$

E$.(52\mathrm{.}93,83\mathrm{.}10)$