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The cost of energy delivered to residences by electrical transmission varies from $0.070/kWh to $0.258/kWh throughout the United States; $0.110/kWh is the average value.

(a) At this average price, find out the cost of leaving a 140-W porch light on for two weeks while you are on vacation?

(b) At this average price, find out the cost of making a piece of dark toast in 3.00 min with a 935-W toaster?

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