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SUBMIT YOUR IDEAHere's the solution! Quite fun doing it in one tool.
My Spoiler
Challenge 10 Bridget
3 calculation types - Mod function is my favorite.
There are many different ways to do this. Note: the input file does not match the output file by 41 seconds as noted by others so don't be alarmed if you results don't match the output file.
I think this challenge should be Basic