The following table gives the map coordinates and the shipping loads for a set of cities that we wish to connect through a central hub.

$\backslash$table$[[$City$,$Map Coordinates $(x,y),$Shipping Load$],[$A$,(4,12),4],[$B$,(7,7),11],[$C$,(5,9),16],[$D$,(8,4),6],[$E$,(7,7),14],[$F$,(2,1),9],[$G$,(2,5),6]]$

a$)$ For the location of the proposed new central hub, the coordinates should be near:

$x=($round your response to two decimal places$).$

$y=($round your response to two decimal places$).$

b$)$ If the shipments from city A triple, for the location of the proposed new central hub, the coordinates should be near:

$x=($round your response to two decimal places$).$

$y=($round your response to two decimal places$).$