Let B represent the area of the base of the rectangular prism. Write an equation that relates the volume, the area of the base, and the height. Please answer answer B and A

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad