Rose's bicycle company makes two types of bicycles: The Mountain Climber, which sells for $300, and the Street Cycle, which sells for $600. Each bike has the same frame and tires, but the assembly and painting time required for the Mountain Climber is only 1 hour, while it is 3 hours for the Street Cycle. There are 300 frames and 360 hours of labor available for production for the next 2 months. How many bicycles of each model should be produced to maximize revenue for Rose's bicycle company?

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?