The instruction booklet for a DVD player says that the player uses about 0.4 kilowatt of electricity per hour. If electricity costs $0.20 per kilowatt per hour. How much does it cost to run the player for an hour?

what is .4(.20) ?

To calculate the cost of running the DVD player for an hour, we need to find the product of the power consumption and the electricity cost.

First, let's convert the power consumption from kilowatts to watts, since the electricity cost is given in dollars per kilowatt-hour. We know that 1 kilowatt is equal to 1000 watts.

0.4 kilowatt = 0.4 * 1000 watts = 400 watts

Now, we have the power consumption in watts.

Next, we'll calculate the cost. The cost per kilowatt-hour is $0.20 (as given in the question).

Cost = Power consumption * Electricity cost

Cost = 400 watts * $0.20 per kilowatt-hour

Since we are calculating the cost for 1 hour, we don't need to convert the time.

Finally, we can calculate the cost:

Cost = 400 watts * $0.20 per kilowatt-hour

Cost = 400 watts * $0.20

Cost = $80

Therefore, it costs $80 to run the DVD player for one hour, considering the given power consumption and electricity cost.