That was an excellent article, I think. I was following along up until the 1.5 multiplier, 50% "profit", 11.1% "retail" price part. I have no idea where those n

That was an excellent article, I think. I was following along up until the 1.5 multiplier, 50% "profit", 11.1% "retail" price part. I have no idea where those numbers came from. Will someone please enlighten me?