Rainbow Tours gives walking tours of Springfield. Rainbow charges $40 per person for the tour and incurs $16 in in variable costs for labor, drinks, and maps. The monthly fixed costs for Rainbow tours are $3600. A. How many tours must Rainbow sell every month to break even? B. Rainbow Tour's owner believes that 175 people a month will sign up for the walking tour. What is the margin of safety in terms of the number of people signing up for the tour