See also discussions here https://www.reddit.com/r/programming/comments/1wbgcke/comment/p8qhrhs/ https://www.reddit.com/r/programming/comments/1wbgcke/commen...

See also discussions here https://www.reddit.com/r/programming/comments/1wbgcke/comment/p8qhrhs/ https://www.reddit.com/r/programming/comments/1wbgcke/commen... on how the actual math works out.