5, (20%) A Geothermal system will cost $20,000 when purchased. Maintenance will cost $200 each year. The device saves $2000 each year for 25 years, after which the salvage value is expected to be zero. Draw the cash flow diagram. What is the Net Present Value if the interest rate is 6%? Show your work. 6, (20%) If the minimum attractive rate of return is 9%, should you invest in the geothermal system presented in question 5? Show your work