9. Dow Chemical can buy a stainless steel tank for $1000, The tank's salvage values are as shown. Using MARR = 10%, a. What is the tank's minimum cost life? b. What is the tank's minimum EUAC? Salvage ($) 900 Year 800 750 600 10. You are considering replacing a current machine (costs shown below) with a new one that has an EUACmin of $3600 for 7 years. a. If the current machine has a remaining EUACmin of $3200, after which year (if ever) should you replace the machine? b. If the current machine has a remaining EUACmin of $3800, after which year (if ever) should you replace the machine? Marginal Cost Year $3800 $3500 $3000 $3500 4 $3800 $4000 6. ** Explain your