For country A, the population in 2000 was 1 billion. It has reached 2 billion in 2020. For country B, the population in 2000 was 160 million. It has reached 800 million in 2020. Which country will have a larger population by the end of 2030, assuming the population fold change is the same?

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For country A, the population in 2000 was 1 billion. It has reached 2 billion in 2020. For country B, the population in 2000 was 160 million. It has reached 800 million in 2020. Which country will have a larger population by the end of 2030, assuming the population fold change is the same?