An electric company charges a certain rate per kilowatt-hour (\text{kwh})(kwh) of electricity used and an administrative fee of \$3.50$3.50. the company charged zhao \$63.25$63.25 for using 800\,\text{kwh}800kwh of electricity. zhao uses the equation, 63.25=800r+3.5063.25=800r+3.50 to represent the situation. what does the variable rr represent in the equation? choose 1 choose 1 (choice a) a the number of kilowatt-hours zhao used (choice b) b the charge per kilowatt-hour (choice c) c the amount of the total charge that depends on the number of kilowatt-hours used

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 represents the total amount of bill charged by electricity comapany to Zhao for 800 kilowatts of electricity use.

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.