Ali wants to install a new air conditioning system in his shopping mall. He found that purchasing and installing the system costs $100,000 and the sale advisor informed him that he expects to save $30,000 every year on electricity bills. The firm's MARRIS 15% per year, maintenance costs are expected to be $5,000 per year and the system's market value will be $20,000 at the end of 15 years. Using the PW method, determine whether the system should be installed