Assess the cost-effectiveness of retrofitting an office building with LED-integrated controls at a cost of 35/m². Before the retrofit, the building has lighting density of 9.5 W/m² for a total floor area of 5,000 m². The lighting system is operated 3,000 hours per year. The electricity price is $0.12/kWh and the LED-integrated controls reduce by 60 percent the lighting energy use. Perform the analysis for a lifetime of 20 years and a discount rate of 5 percent.