Final answer:
In 2010, using PPP prices, China was the world's second largest economy with $9.5 trillion GDP, behind the United States at $16.8 trillion.
Step-by-step explanation:
Using PPP (Purchasing Power Parity) prices, China ranked as the world's second largest economy in 2010. At that time, China's GDP stood at $9.5 trillion, which was second only to the United States, which had a GDP of $16.8 trillion. Despite having a lower per capita GDP compared to the United States, China's economic growth has been significant, and projections have suggested that it may overtake the U.S. as the world's largest economy by 2030. However, this trajectory could be affected by domestic challenges like income inequality and pollution within China.