Consider a 500-m² retail store with EUI of 172 kWh/m2/year and an annual sales of US$600/m2. Perform LCC and EP analyses to assess the effectiveness of investing in more energy-efficient air-conditioning system that can reduce the EUI to 125 kWh/m2/year. Assume that (i) the cost of the air conditioner increases from US$5000 to US$6500 when upgrading from standard to energy efficient, (ii) electricity cost is US$0.10/kWh, and (iii) life of the air conditioner is 15 years and the discount rate is 5 percent (so that USPW = 10.4 years), (iv) sales remain unchanged.