Armed Forces Classification Test (AFCT) Arithmetic Reasoning Practice Test

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Study for the AFCT Arithmetic Reasoning Test. Explore in-depth questions, enhance problem-solving skills with hints and detailed explanations. Ace your assessment!

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A charge is 12 cents per kilowatt hour. How much does it cost per year to run a TV which uses 10 kilowatt hours per week?

$62.40
$36.00
$50.40
$100.80

The correct answer is: $62.40

To find the annual cost of running a TV that uses 10 kilowatt hours per week at a charge of 12 cents per kilowatt hour, you can follow these steps: 1. **Calculate Weekly Cost**: First, determine the cost to run the TV for one week. Multiply the number of kilowatt hours used per week (10 kWh) by the charge per kilowatt hour (12 cents): \[ 10 \, \text{kWh} \times 0.12 \, \text{dollars/kWh} = 1.20 \, \text{dollars per week} \] 2. **Calculate Annual Cost**: Since there are 52 weeks in a year, multiply the weekly cost by the number of weeks in a year to get the total annual cost: \[ 1.20 \, \text{dollars/week} \times 52 \, \text{weeks/year} = 62.40 \, \text{dollars per year} \] Thus, the annual cost to run the TV is $62.40, confirming that this calculation aligns with the provided answer. This method summarizes how changing the frequency or rates could impact