Question 5 20 pts Determine the ESL, at i = 10% per year for equipment that has a first cost of $8,000 and the estimated operating costs and year-end salvage values shown below Year Operation Cost Salvage Value $ per year $ 1 2 3 - 1000 -1200 -1300 6000 5000 3000 2000 4 -2100 0 1 year 2 years 3 years 4 years