11. (5 points) in a study of purchasing behavior at a small shop, it was found that if a purchase was more than $5, the customer wil pay with a credit card with a probability of 0.8. If the purchase was $5 or less then the cust will pay with a credit card with a probability of 0.5. The probability that purchase is more than $5 is 0.87. A) What is the probabity that a customer will pay with a credit card? B) A customer did not pay with a credit card. What is the probablity that the purchase was less than $57