An ice cream vendor sells three flavors: chocolate, strawberry and vanilla. 45% of the sales are chocolate, while 30% are strawberry, with the rest vanilla flavor. Sales are by the cone or the cup. The percentages of cone sales for chocolate, strawberry and vanilla are 75%, 60% and 40%, respectively. For a randomly selected sale, define the following events:
A1-chocolate chosen
A2-strawberry chosen
A3-vanilla chosen
B-ice cream in a cone
B1-ice cream in a cup
Find the the probability that the ice cream was sold in a cup and was strawberry flavor.