Question

An electric company calculates a person's monthly bill from the number of

kilowatt-hours (kWh), x, used.
The function
b(c)
{
0.102,
X is greater than or equal to 200
0.15(x – 200) + 20, 2 > 200
determines the
bill.
How much is the bill for a person who uses 400 kWh in a month?

Answer 1

D. $80 apeggs

Explanation:

Answer 2

The bill is $30

Explanation:

Given

`b(x) = \left \{ {{0.10x,\ x \le 200} \atop {0.15(x - 200)\ x > 200}} \right.`

See attachment

Required

Determine the bill when KWh = 400

From the given piece-wise function.

We make use of:

`b(x) = 0.15(x - 200)`

Because
`400 > 200`

Substitute 400 for x in b(x)

`b(400) = 0.15 * (400 - 200)`

`b(400) = 0.15 * 200\\`

`b(400) = 30`

The bill is $30