Suppose you have a 2000 Watt water heater that is on for a total of 150 hours a month. How much will this cost you at a rate of 10 cents per kW*hr?

$30

Explanation:

Given that,

Power of a water heater, P = 2000 Watts

It is on for a total of 150 hours a month.

2000 Watts = 2 kW

Time, t = 150 hours

Energy used by the water heater is given by :

It is also mentioned that the cost is 10 cents per kWhr.

Since, $1 = 100 cents

10 cents = $0.1

So, the total cost for the month is :

Cost = 300 × 0.1

Cost = $30

So, the required cost is $30.

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