Give the step-by-step reasoning process and then the final answer. Marco loves trading cards. He has a total of 500 cards on hand, and a fourth of them are duplicates. Marco decides to trade one-fifth of these duplicates for completely new cards to his friend Josh. How many new cards did Marco get?
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Marco has 500 * 0.25 = 125 duplicate trading cards. He wants to trade off 125 * 0.2 = 25 cards for new ones.
The final answer: 25.
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