Question: Build a spreadsheet to find the EAC of each roof in Problem 8-28. Use the GOAL SEEK tool to Excel to find the IRR of
Build a spreadsheet to find the EAC of each roof in Problem 8-28. Use the GOAL SEEK tool to Excel to find the IRR of the incremental investment to.
Data from 8-28
Our cat Fred's summer kitty-cottage needs a new roof. He's considering the following two proposals and feels a 15-year analysis period is in line with his remaining lives. Which roof should he choose if his MARR is 12%? What is the actual value of the IRR on the incremental cost? (There is no salvage value for old roofs.)

Thatch Slate $40 2 First cost Annual upkeep Service life, in years $20 3
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