Q$4.$solve using excel and provide screenshots

Young entrepreneur Susie Perez has launched a business venture in which Susie uses stories submitted by university students as the basis for comics in a monthly anime$-$style magazine. Based on market research, Susie estimates that average monthly demand will be $500$ copies. Susie has decided to model monthly demand as normal random variable with a mean of $500$ and a standard deviation of $300.$ Susie must pay a publishing company $$3\mathrm{.}75$ for each copy of the comic printed. Susie then sells the magazine for $$5$ each. Rather than having a store$-$front, Susie sells the magazines through a group of student vendors who sell the comics out of their backpacks while on campus. Susie pays a student vendor $$0\mathrm{.}35$ for each magazine sold. Susie only sells each issue for one month, and then a new issue is sold. However, the publishing company has agreed to buy back any unsold copies at the end of each month for $$2\mathrm{.}25.$ Construct a simulation model that computes Susie's profit. a$.$ As Susie validates the simulation model you have constructed, Susie observes that when using a normal distribution with a mean of $500$ and a standard deviation of $300$ to model demand, negative values of demand are often generated. How can you modify the simulation model to address this issue? b$.$ Based on the simulation model that incorporates a remedy for the validation issue observed in part $($a$),$ what is the estimate of the average profit if Susie sets the order quantity to $1,200?$ What is the $95\%$ confidence interval on this estimate of average profit? c$.$ For an order quantity of $1,200$ copies, what is the profit value such that $2\mathrm{.}5\%$ of the profit outcomes are smaller than this value? What is the profit value such that $2\mathrm{.}5\%$ of the profit outcomes are larger than this value? Why doesn't this range correspond to the $95\%$ confidence interval in part $($b$)?$