Using the grid technique, determine the least$-$cost location:

Customer

A

B

C

D

E

Tons

$100$

$300$

$200$

$500$

$1000$

Grid Coordinates

$(1$;$11)$

$(7$;$11)$

$(5$;$9)$

$(7$;$7)$

$(1$;$1)$

The Grid center coordination is and $($round the results to $2$ decimal places$)$