You're trying to determine whether to expand your business by building a new manufacturing plant. The plant has an installation cost of $12.7 million, which will be depreciated straight-line to zero over its four-year life. If the plant has projected net income of $1,924,300, $1,977,600, $1,946,000, and $1,399,500 over these four years, respectively, what is the project's average accounting return (AAR)?