The direct and easy solution for this problem is through dimensional analysis. This is done by cancelling out the same units of dimensions resulting to the unit of what is asked. In this case, the resulting unit should be in $.
The number of hours in a day from 7:15 am to 2:45 pm is 7.5 h. In 187 days, that would be:
187 days * 7.5 h/day = 1402.5 h
The rest of the solution goes:
1402.5 h * $0.1/kWh * 1 kW/1000 W * 35 W/bulb * 72 bulbs =
$353.43
The whites were forced to enslave blacks because they couldnt inhabit the same land and they needed more workers and didnt want to pay them with money they didnt have
Answer: B
did a small amount of research and this was the only answer that popped up under my searches.