What are some examples of notable corporate inversions?

Question 3 to 5 are based on the Big Mac Index from Economist: 3. In country ABS, the price of big mac in China is Yuan 10.5; In the U.S., a big mac costs $3.1. What is the implied exchange rate according to the PPP theory? (PPP theory is basically the law of one price. It means that an identical good should be sold at identical price across countries.) 4. At the time of the publication of the article, the exchange rate between the dollar and the yuan is yuan 8.03 / dollar. Is dollar overvalue compared to the theoretical price in the Question 3?! 5. As it was pointed out in the article, Chinese Yuan is undervalued by 58%. The article concludes with "Economists would be unwise to exclude Big Macs from their diet, but Super size servings would equally be a mistake." Please explain