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At the beginning of 2019, a government had a total debt of $540 billion dollars. It ended 2019 with a $16 billion dollar budget surplus. In 2020, it experienced a budget deficit of $7 billion dollars. What is the total debt of the government equal to at the end of 2020? O a) $573 billion b) $563 billion c) $531 billion O d) $517 billion