How to solve Using excel, please show steps ans formula

$10-20.$ Lionel's Life Jacket Rentals leases life jackets each day from a supplier and rents them to customers who use them when they raft down the Delaware River. Each day, Lionel leases $30$ life jackets from his supplier at a cost of $$4$ per life jacket. He rents them to his customers for $$15$ per day. Rental demand follows the normal distribution, with a mean of $30$ life jackets and a standard deviation of $6$ life jackets. $($In your model use integers for all demands.$)$

$($a$)$ Simulate this leasing policy for a month $(30$ days$)$ of operation to calculate the total monthly profit. Replicate this calculation $N$ times. What is the average monthly profit?

$($b$)$ Lionel would like to evaluate the average monthly profit if he leases $25,30,35,$ and $40$ life jackets. What is your recommendation? Why?

Problem $10-20-$ Revenue Management Problem

$($Calculations set to Manual. Press F$9$ to recalculate$),$

$\backslash$table$[[$Day$,$Demand,Revenue,Cost,Profit$],[1,,,,],[2,,,,],[3,,,,],[4,,,,],[5,,,,],[6,,,,],[7,,,,],[8,,,,],[9,,,,],[10,,,,],[11,,,,],[12,,,,],[13,,,,],[14,,,,],[15,,,,],[16,,,,],[17,,,,],[18,,,,],[19,,,,],[20,,,,],[21,,,,],[22,,,,],[23,,,,],[24,,,,],[25,,,,],[26,,,,],[27,,,,],[28,,,,],[29,,,,],[30,,,,],[,,$Mont ly profit $=,]]$

Data Table