Question

An electric company calculates a persons monthly bill from the number of kilowatt kWh, x, used

The function (in photo ) determines the bill

How much is the bill for a person who uses 400 kWh in a month

A. 50
B. 60
C. 40
D. 30

Answer 1

A. 50

Explanation:

Answer 2

Option (A)

Explanation:

From the given piecewise function that represent the amount of bill from number of units of electricity used is 'x' kWh.

b(x) = 0.10x when x ≤ 200

0.15(x - 200) + 20 when x > 200

For x = 400 kWh,

Function which represents the expenses of the bill,

b(400) = 0.15(400 - 200) + 20 [Since x > 200]

= 0.15(200) + 20

= 30 + 20

= $50

Therefore, Option (A) will be the answer.