Kevin has lived in a new apartment for 30 days. He realizes his back patio light has been on the entire time. The patio light used 100 watts of power for 720 hours. The cost of each kilowatt hour is $0.12. How much money has the patio light cost Kevin?

$8640

Explanation:

kwh = P×t Equation 1

Where P = power in watts, t = time in hours.

From the question,

Given: P = 100 Watts, t = 720 hours

Substitute these values into equation 1

Therefore,

The total kilowatt hour used by the patio light = 100×720

= 72000 kwh.

From the question,

If,  1 kwh ⇒ $0.12,

Then, 72000 kwh ⇒ $(0.12×72000)

= $8640

Hence, the patio light cost kevin $8640