Determine the energy and cost savings of daylighting harvesting to a thin two-story house building (each floor is 24 ft × 50 ft) with a window-to-floor area ratio of 30%. The building has clear windows (i.e., visible transmittance = 0.78) and is located in Denver, CO. The lighting system has a density of 0.5 W/ft2 and operates 3000 h/year. Assume that the cost of electricity is \($0.10/kWh.\)