1. In 2022, GDP was 25,439.7 (in billion US dollars) for the US and 17,963.2 (in billion US dollars) for China. Population was estimated to be 1,425.897 million for China and 338.289 million for the US around 2022. (a) Calculate the GDP per capita for China and the GDP per capita for the US in 2020. (b) Assume that GDP per capita grows at three percent per year for China and one percent per year for the US. Calculate the year China will surpass US in GDP per capita in this scenario. (c) It is widely predicted that population growth of China will slow and even decline in the next decade. What policy China adopted in the past could explain this development? (d) Assume, in addition to the scenario in (b), population grows at zero percent in the next ten years and then at one percent per year in China. Also, assume population grows at one percent per year in the US. Calculate the year China will surpass the US in GDP