sir I can't solve questions number 1 and 3

1.Assume that an iPhone 12 Pro costs 11100 yuan in China and 1300 dollars in your country. If the exchange rate is 6.52 yuan per dollar, what is the real exchange rate? Explain the result. 2. A country recently had GDP of $2,700 billion. Its consumption expenditures were $800 billion, its government spent $350 billion, and it had domestic investment of $500 billion. What was the value of this country's net capital outow? Show your calculations. 3. According to the latest statistical information, in 2020 China purchased $2.06 trillion worth of goods and services from foreign countries, sold $2.59 trillion worth of goods and services to foreign countries and had national saving of $4.98 trillion. What was the value of its domestic investment? Show your calculations