The Economist publishes annually the hamburger standard by which they compare the prices of the McDonalds Corporation Big Mac hamburger around the world. The index estimates the exchange rates for currencies based on the assumption that the burgers in question are the same across the world and therefore, the price should be the same. If a Big Mac costs $2.54 in the United States and 294 yen in Japan, what is the estimated exchange rate of yen per dollar as r as hypothesized by the Hamburger index?