Answer:
$10.08
Explanation:
We have;
- A 200 W lamp
- Power utility rate is $0.30 per kWh
We need to determine the cost of operating the lamp for a week.
- First is to determine the number of hours in a week;
1 week = 7 days
1 day = 24 hours
Thus;
7 days = 168 hours
Therefore;
Power in kWh for a week = (200 W × 168 hrs) ÷ 1000
= 33.6 kWh
But;
1 kWh = $0.30
Therefore;
Cost of operating the lamp = 33.6 kWh × $0.30 per kWh
= $10.08
Therefore, the cost of operating a 200 W lamp for a week is $10.08
