When you last contacted a company with a product or service request, which contact optons did you have? Which option did you choose. and why?

What are service enhancement?

I am at the solution for this problem located here:  https://www.bartleby.com/questions-and-answers/during-the-morning-hours-at-a-catalog-sales-department-telephone-calls-come-in-at-the-rate-poisson-o/84d565ca-a1df-41b5-9faf-34fcebd84805      I just don't understand how they arrive with the solution below:   0.3903 = 1-P / 0.2963037 1-P = 0.1156.  I just don't understand the math here.  Any help in understanding will be extremely appreciate>

As a student, tell me about your most memorable sale transaction/s experience. Answer thoroughly.