The cost of energy delivered to residences by electric transmission varies from \( \$ 0.070 / \mathrm{kWh} \) to \( \$ 0.258 / \mathrm{kW} \) throughout the United States; \( \$ 0.110 / \mathrm{kWh} \) is the averag value. At this average price, calculate the cost of (a) lea ing a 40.0-W porch light on for two weeks while you are o vacation, (b) making a piece of dark toast in 3.00 min wit a 970-W toaster, and (c) drying a load of clothes in 40.0 mi in a \( 5.20 \times 10^{3} \)-W dryer.
