Could you please explain your answers thoroughly? Thanks in advance

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(7 points) A sale is being run at a certain Game store that you Stop by, and they are charging $25 for used video games and $50 for new video games. Suppose that 69% of all customers want used video games and that anyone that comes to the sale makes a purchase. If 36 customers come to the sale what is the resulting expected revenue?(8 points) A bookstore has ordered 6 copies of a certain issue of a wildlife journal. Let X be the number of individuals who come in to purchase this journal. If X has a Poisson distribution with parameter / = 3, what is the expected number of copies sold? Hint: the answer is not 3