answer is b, plz show how to get the answer by hand or by excel ( show excel equations )

Question text For equipment that has a first cost of $10,000 and estimated operating costs and year-end salvage values shown below, the economic service life at-10% per years is Year 0 Operating Cost, $/year 2800 3100 3400 3400 -3400 4500 4900 Salvage Value, $/year 10,000 7500 6000 5000 4000 2500 1500 4 Select one: a. The ESL is 6 years b. The ESL is 5 years c. The ESL is 4 years d. The ESL is 3 years