Please include formulas and calculations. Thanks

Your company has to come up with a new water treatment plant according to new environmental regulations. There are two options. Option A entails an initial investment of $40,000 and will have a life of 6 years. The maintenance cost of Plant A from year 1 to year 6 will be as follows: $8000 (year 1), $14,000 (year 2), $13,000 (year 3), $12,000 (year 4), $11,000 (year 5) and $10,000 (year 6). Option B entails an initial investment of $20,000 and will have a life of 3 years. The maintenance cost of Plant B from year 1 to year 3 will be as follows: $7,000 (year 1), $13,000 (year 2) and $13,000 (year 3). Which Plant the company should choose? The discount rate is 10%. (assume that these options are repeatable options) Points: 6