You have calculated that the heating cost of your house next year will be 8,000 TL per year. Your heating costs are increasing by 500 TL each year. An insulation company told you that with the insulation system it will make for 100,000 TL, you will have 80% less heating costs. You know that you want to use this house for another 30 years. With the methods you learned in this lesson, you wanted to decide whether this investment was good or not, you calculated, but could not decide whether to have it done with the result you found. What is your MARR?