in a certain city, electricity costs. 10 per K. W. h. what is the annual cost dor electricity to power a lamppost for 5 hours/day with a 100 watt incandescent light bulb

The annual cost is $18.25.

Step 1. years → days

1 yr * (365 days/1 yr) = 365 days

Step 2. days → hours.

365 days * (5 h/1 day) = 1825 h

Step 3. hours → watt-hours

1825 h * 100 W = 182 500 W·h

Step 4. watt-hours → kilowatt-hours

182 500 W·h * (1kW·h/1000 W·h) = 182.5 kW·h

Step 5. kilowatt-hours → dollars

182.5 kW·h * ($0.10/1 kW·h) = $18.25