Question

The function below can be used to find the total amount (C(x)) an electric company charges a customer who uses (x) kilowatt-hours (kWh) in a month.

C(x)=c
0.07275 x+6.00, if 0 ≤ x ≤ 400
0.05535 x+35.10, if x > 400
If a customer uses (546kWh) in a month, what is the total amount charged?
f. $45.72
g.$65.32
h. $78.28
i. $111.04

Answer 1

$65.32

Explanation:

We have two functions here, c = 0.07275x + 6, where x is between 0 and 400, and 0.05535x + 35.1, where x is greater than 400.

Since x = 546, we use function two.

0.05535(546) + 35.1
30.2211 + 35.1
65.3211

Since we are dealing with money, we round to $65.32.