Edit: I've added in the months_until_next_payment column. This would be more efficiently done in the application rather than with a self join however as SQL Server does not have any particularly satisfactory way of referencing next and previous rows.
You can do it using cursor. Language like c#/java are better choice for this problem.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.