Answer:
B. The charge per kilowatt-hour.
Step-by-step explanation:
We have been given that an electric company charges a certain rate per kilowatt-hour of electricity used and an administrative fee of $3.50. The company charged Zhao $63.25 for using 800 kWh of electricity.
The equation [tex]63.25=800r+3.50[/tex] represents the total amount of bill charged by electricity comapany to Zhao for 800 kilowatts of electricity use.
[tex]\text{The total amount of bill}=\text{Units of electricity used*Charges per kilowatt of electricity use+ Administrative fee}[/tex]
Since total bill is $63.25, administrative fee is $3.50 and total use of electricity is 800 kilowatts, therefore, r represents the charge per kilowatt hour and option B is the correct choice.
