Given the retail location coordinates and the value of material movement in the following chart, find the best supply point location using the center-of-gravity method. 
Definitions:
Hz
Hertz, a unit of frequency equivalent to one cycle per second.
RC Parallel Circuit
A circuit consisting of a resistor (R) and a capacitor (C) connected in parallel with each other across a voltage source.
Resistor Voltage
The voltage across a resistor, determined by the current flowing through it and its resistance value.
Capacitor Voltage
The electrical potential difference across the terminals of a capacitor, dependent on the charge stored and the capacitor's capacitance.
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