Armed Forces Classification Test (AFCT) Arithmetic Reasoning Practice Test

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How much does it cost per year to run a TV that uses 10 kilowatt-hours per week, if the charge is 12 cents per kilowatt-hour?

$52.16
$54.24
$62.40
$64.80

The correct answer is: $62.40

To determine the annual cost of running a TV that uses 10 kilowatt-hours (kWh) per week, follow these calculations: 1. Calculate the total kilowatt-hours used in one year. Since the TV uses 10 kWh per week, you multiply this figure by the number of weeks in a year. There are 52 weeks in a year: \[ 10 \text{ kWh/week} \times 52 \text{ weeks/year} = 520 \text{ kWh/year} \] 2. Next, calculate the total cost by multiplying the total kilowatt-hours for the year by the cost per kilowatt-hour. The cost is 12 cents, which is equivalent to $0.12: \[ 520 \text{ kWh/year} \times 0.12 \text{ dollars/kWh} = 62.40 \text{ dollars/year} \] This result shows that the annual cost to run the TV is $62.40. Therefore, option C is correct because it accurately reflects the calculations based on the usage rate and cost per kilowatt-hour.