Answer to Question #27353 in Statistics and Probability for uzair shaikh

Question

A credit department reported that 30% of their sales are cash or check, 30% are paid with a credit card and 40% with a debit card. Twenty percent of the cash or check purchases, 90% of the credit card purchases and 60% of the debit card purchases are for more than $50. A customer just purchased a new dress that cost $120. What is the probability that she paid cash or check?