The monthly charge (in dollars) for x kilowatt hours (kWh) of electricity used by a commercial customer

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The monthly charge (in dollars) for x kilowatt hours (kWh) of electricity used by a commercial customer is given by the following function.
if 0Sx<5 if 5<x<750 if 750 <x< 1500 if x>1500 7.52 + 0.1079x 19.22 + 0.1079x C(x) = 20.795 + 0.1058x 131.345 + 0.0321x

Find the monthly charges for the following usages.
(a) 5 kWh
(b) 6 kWh
(c) 3000 kWh

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