Please answer the following question, the correct answer is bolded below. Please do not use excel and show all formulas and work. Thank you! I rate.

An environmental engineer must recommend one of two methods for monitoring high colony counts of E. coli and other bacteria in watershed area hot spots. Estimates are tabulated, and the MARR is 10% per year. Use the ROR analysis to select the better method

ANSWER: 7.45%, choose method A

Method A Method B 250,000 20,000 Initial cost, $ Annual operating cost, S per year 100,000 -30,000 in year l increasing by 5000 each year Life, years Method A Method B 250,000 20,000 Initial cost, $ Annual operating cost, S per year 100,000 -30,000 in year l increasing by 5000 each year Life, years