If there is a deposit of $20 billion of new currency into the banking system excess reser

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If there is a deposit of $20 billion of new currency into the banking system, excess reserves will increase by ______.

A.$2 billion.

B.$18 billion.

C.$20 billion.

D.$48 billion.

请帮忙给出正确答案和分析,谢谢!

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