zippy is earning 30,000 per year working for joe's car repair. He also has a savings of 150,000, on which he is earning 10% annual interest. He decides to leave. In the first year, Zippys earns a revenues of 200,000 and has explicit costs of 150,000. what is zippy's economic profit (or loss) in the first year? I tried looking up the equation but just want to double check