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In a shop, 20% of the customers spend at least 1000 dollars. Among those spending at least 1000 dollars, 30% pay by credit card, while

In a shop, 20% of the customers spend at least 1000 dollars. Among those spending at least 1000 dollars, 30% pay by credit card, while among those spending less than 1000 dollars, only 10% pay by credit card. Suppose a randomly chosen customer is found to have paid by credit card. What is the probability that he or she spent at least 1000 dollars?

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