# The monthly charge in dollars for x kilowatt-hours (kWh) of electricity used by a residential consumer of an electric company from November through June is given by the function below.C(x) =20 + 0.188x if 0 ≤ x ≤ 10038.80 + 0.15(x − 100) if 100 < x ≤ 50098.80 + 0.40(x − 500) if x > 500(a) What is the monthly charge if 1800 kWh of electricity is consumed in a month?

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
Question

The monthly charge in dollars for x kilowatt-hours (kWh) of electricity used by a residential consumer of an electric company from November through June is given by the function below.
C(x) =

20 + 0.188x if 0 ≤ x ≤ 100
38.80 + 0.15(x − 100) if 100 < x ≤ 500
98.80 + 0.40(x − 500) if x > 500
(a) What is the monthly charge if 1800 kWh of electricity is consumed in a month?

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