3. To upgrade the lighting in an office building with LED fixtures will cost $800 per 1000 square feet plus $150 per 1000 square feet for annual maintenance, and it will last for 6 years before replacement is needed. Using fluorescent fixtures, the costs are $600 and $100, respectively, and the replacement period is 8 years. If LED fixtures are installed, rents will rise by $400 per 1000 square feet; if fluorescent fixtures are used, rents will rise by $350 per 1000 square feet. Which option should be adopted if the interest rate is 12% per year? Use the interest rate table to solve it. (15 points)