4. Bill Heckle's last electric bill is shown below. WATTCO LIGHTING CORPORATION FOR SERVICES то Bill Heckle 12 Cavern St. Linwood, KS 66052 ACCOUNT NUMBER 8761-21 BILL DATE AUG 11 SERVICE PERIOD METER READING SERVICE FROM то PREVIOUS PRESENT USAGE AMOUNT ELECTRIC JUL 3 AUG 4 21,780 24,100 2,320 $255.20 a. What was the previous reading? b. What is the present reading? c. How many kilowatt-hours of electricity did Bill use during the service period shown? d. What did Wattco charge per kilowatt-hour of electricity? e. The bill covers 31 days of electric use. What was Bill's average daily expense for electricity for this service period? Round to the nearest cent.

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