In 1990, the price level for the United States was 100, the price level for Pugelovia was also 100, and in the foreign exchange market one Pugelovian pnut (pronounced "p'noot") was equal to $1. In 2013, the U.S. price level had risen to 260, and the Pugelovian price level had risen to 390.
a. According to PPP, what should the dollar-pnut exchange rate be in 2013?
b. If the actual dollar-pnut exchange rate is $1/pnut in 2013, is the pnut overvalued or undervalued relative to PPP?