If an office area has an average continuous lighting load of 875 watts. What is the energy cost of providing lighting to this area for an 8-hour day, based on a unit cost of 5 cents per kilowatt-hour?

A waste line on a sloping lot must be run a horizontal
distance of 85 feet. The vertical rise has been calculated
to be 8.5 feet. What will be the percent grade of the
waste line?