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SUBMIT YOUR IDEAI enjoyed this challenge. I recently learned how to use the Tile Tool so I have been looking for excuses to use it although I'm not sure that this particular case really calls for it. Still - I got to the solution eventually! Looking forward to seeing a more efficient solution.
EDIT: So after taking a peek at some of the other solutions users have posted, the biggest inefficiency with my workflow is I should have used a Summary Tool instead of a Running Total tool. Doh!
I was sluggish getting started on this and probably not very elegant, but got there just the same 🙂
Here's my solution. Not that different from the others.
My solution.
Here is my solution: