An army division in Afghanistan has five troop encampments in the desert. The division leaders want to determine the best location for a supply depot to serve the camps. The (x, y) coordinates (in kilometres) of the camps, A, B, C, D, and E, and the daily amount of supplies (in tonnes) required at each camp are as follows:

Determine the best site for the supply depot using the center of gravity technique.

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Coordinates Daily tonnage Camp (1000s) A 110 120 85 70 300 110 520 350 75 300 450 60 E 400 600 100