(Purchasing-power parity) A McDonald's Big Mac costs 2.53 yuan in China but costs $4.17 in the United States. Assuming that purchasing-power parity (PPP) holds, how many Chinese yuan are required to purchase 1 U.S. dollar?
Assuming that purchasing-power parity (PPP) holds, how many Chinese yuan are required to purchase 1 U.S. dollar? yuans (Round to four decimal places.)