Final answer:
To calculate the monthly cost of manual electricity generation at $9/hr, multiply the total hours in a month (720) by the hourly rate, which would result in $6480, none of the provided answer choices match this calculation.
Step-by-step explanation:
To determine how much you would have to pay for electricity for one month if you replaced fossil fuels with manually generated electricity using a hand crank generator at a cost of $9/hr per person, you first need to establish the number of hours in a month. A typical month has about 30 days. Assuming continuous generation, which means 24 hours a day, we calculate 30 days multiplied by 24 hours/day to get 720 hours per month. Multiplying this by the cost per hour gives us a total cost.
720 hours/month × $9/hr = $6480 per month for one person to generate electricity.
However, this does not match any of the answer choices provided, implying that additional information or context is needed to select an appropriate answer from A) $360 B) $540 C) $720 D) $900. It seems there may be a miscalculation or misunderstanding in the question parameters as provided.