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EG ITY A watt is a unit of power, which measures energy used per unit time. A kilowatt hour means 1 kilowatt of electricity used continuously for 1 hr. The electric utility company in Laura's town charges $0.05752 for each kilowatt hour used. Laura heats her house with three electric heaters that each use 1200 watts a. How much does it cost to heat her house for 1 day? b. How many hours would a 75-watt lightbulb have to stay on to result in $1 for electricity charges? a. It costs approximately $ (Round to the nearest cent as needed.) b. Approximately hours (Round to the nearest hour as needed.)