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SUBMIT YOUR IDEAI got most of the way but I had to poke around the forums for a way to get rid of reciprocal duplicates :)
Going back in our user group and doing old challenges. This was rough, I tackled it a couple different ways before I settled on an approach I liked. It was still fairly hard coded, so if I were to do this for real, I would want to build out the summations and mud functions to do it dynamically with math.
This one took me lots of trial and error to get right. Reading the comments, I felt better knowing that I wasn't the only one to struggle on this challenge.