Question

A power company calculates a person's monthly bill from the number of

kilowatt-hours (kWh), x, used.
The function b(x) = {
0.15%,
0.10 (20 – 400) + 60,
2 < 400
2 > 400
determines
the bill.
How much is the bill for a person who uses 600 kWh in a month?
O A. $80
B. $90
C. $100
O D. $110

Answer 1

Answer: (a)

Explanation:

Given

The function
`b(x)` is given for the bill as per the kilo-watt hours used

for 600 kWh in a month,
`b(x)` is

Substitute 600 for
`x` in
`b(x)`

`\Rightarrow 0.10(600-400)+60\\\Rightarrow 0.10(200)+60\\\Rightarrow 20+60\\\Rightarrow 80`

Therefore, the bill for a person is
`\$80`