Challenge #17: Month-over-Month Retention Rate

[Reesetrain2]

All,

My solutuion after many a trial-and-error!

-Cheers!

Spoiler

[Alekh]

Spoiler

[David-Carnes]

Pretty straightforward.  The only "oh, duh" moment came when I realized I had left out part of the equation to enumerate the accounts open at each month.  I had thought it through when examining the data but spaced on it during the actual crafting of the macro.

Spoiler

[ADerbak]

Solution Attached!

[Niklas]

Wanted to try without the macro, the solution for tracking previous cancellation isn't as scalable / resilient as I'd like, but it works. 

[Eleonora]

My solution

Spoiler

[FRANCK_ROUQUETTE]

Thank You for the exercise - please find attached my proposed solution.

[Vidya26]

My Solution!!

[Tom_Luthi]

solution attached.

[ConradW]

17-complete