needs help this probability and statistic question with clear steps thannkk

[10 points) 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