Question

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

The monthly charge (in dollars) for x kilowatt hours (kWh) of electricity used by a commercial customer is given by the following function.

C(x) =
7.52 + 0.1079x     if 0 ≤ x ≤ 30
19.22 + 0.1079x     if 30 < x ≤ 750
20.795 + 0.1058x     if 750 < x ≤ 1500
131.345 + 0.0321x     if x > 1500

Find the monthly charges for the following usages. (Round your answers to the nearest cent.)

(a)    30 kWh
$

(b)    33 kWh
$

(c)    9000 kWh
$

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