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, calculate the cost of leaving a 140-W porch light on for two weeks while you are on vacation?
(b) At this average price, calculate the cost of making a piece of dark toast in 3.00 min with a 935-W toaster?
(c) At this average price, calculate the cost of drying a load of clothes in 40.0 min in a 5.60 103-W dryer?