can you show the work and how you got this thank you!!!~

A semiconductor manufacturer has been ordered by the city to stop discharging acidic waste liquids into the city sewer system. Your analysis shows you should select one of the following three systems. The system is expected to be used for 20 years, but the CleanH2O system will only last for 10 years, and then will need to be replaced with an identical system. If the cost of money is 8%, which system should be purchased? Do a pre-tax analysis