What closing time should 21st Century Liquors choose to maximize profits?

Read the case that has been given in the pdf form.
The case is called “21st Century Liquors”
Answer Question Number 4:
“Assume that you are Janice Wilton and you have been asked to elaborate on the memo in Exhibit 1 to address the issues raised by Ted Radcliff in both of his conversations with you. Use the report form from the course website and please be certain to address all of the following issues:

What closing time should 21st Century Liquors choose to maximize profits?

Q. 4.What closing time should 21st Century Liquors choose to maximize profits? Calculate the increase in profits (relative to the current closing time of 10pm) that would result from extending store hours to 4am. If you recommend a different closing time, calculate the increase in profits (again relative to the current closing time) that would result from your recommendation. “

What closing time should 21st Century Liquors choose to maximize profits?