Economics question regarding profits and calculations

A small town is served by
two grocery stores, White and Gray.  Each store must decide whether it
will remain open on Sunday or whether it will close on that day. 
Monthly payoffs for each strategy pair are shown in the following table:

1. Which firm is the more profitable in this market?
2. Does the firm you identified as more profitable have a dominant strategy?
3. Based on your calculations, what should the more profitable
   firm do: open on Sundays or close on Sundays?  Explain your answer.
4. Is this an example of a Prisoner’s Dilemma?  Explain your answer.