Probability of Prefering Ice Cream Shop B

In a certain city, there are two competing ice cream shops, Shop A and Shop B. Shop A sells chocolate and vanilla flavors, while Shop B offers strawberry and pistachio flavors. The customers have varying preferences for these flavors. In a survey conducted with 200 customers, 70% preferred chocolate, 20% preferred vanilla, and the remaining customers had preferences for the flavors offered by Shop B.

If a customer is randomly selected from the survey, what is the probability that this customer prefers a flavor from Shop B?