A restaurant noted what type of food its customers ordered last week. Here are the results: A Venn diagram of probability consists of two overlapping circles within a rectangular box. The circles represent burgers and fries. Probabilities are labeled within as follows. Burger, 30%. Fries, 10%. Burgers and fries, 40%. A probability of 20% is labeled outside of the circles.
Find the probability that a randomly chosen customer ordered a burger given that they ordered fries.