A manufacturer of cat towers wishes to locate a super assembly facility to meet their cat tower ...

A manufacturer of cat towers wishes to locate a super assembly facility to meet their cat tower assembly needs for the next millennium. Currently, carpet, cylinders, yarn and fasteners are purchased in bulk from suppliers in North Haverbrook, Ogden, and Springfield in the quantities shown in the table. The super assembly facility would ship to distribution centers located in Seattle, Lubbock, Nashville, and Philadelphia. The locations of all of these cities on an x-y grid, outbound transportation costs on a ton per mile basis, and total tonnage are all contained in the table.

Sources/Markets   Transportation Cost $/ton mile (Fn)   Quantity in Tons (Dn)   Xn   Yn
Supply            
North Haverbrook   1.1   650   700   1200
Ogden   1.2   450   250   600
Springfield   1.4   400   225   825
Market            
Seattle   2.25   300   50   1200
Lubbock   2.25   200   450   300
Nashville   2.25   500   800   250
Philadelphia   2.25   500   950   1100

What is the optimal location for the Super Assembly Center?
A) (550, 808)
B) (513, 772)
C) (526, 795)
D) (538, 784)