Company A has 10 million shares at $100 each. Company B has 5 million shares at $200 each. What is the total market capitalization for these companies?

Market capitalization equals the number of shares multiplied by the price per share. Company A is worth 10 million × $100 = $1 billion, and Company B is worth 5 million × $200 = $1 billion. Together, their total market capitalization is $2 billion, so the correct choice is $2 billion.

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