I know that one of these questions specifically identifies an electric furnace but it’s still a bit confusing to study 2100 questions and have these two questions be almost identical but with slightly different answers. So, I’m wondering why they are so slightly different. I doubt I would make the mistake of choosing 195 but that would be closer to 200 than 210. And 212 is closer to 210 than 200. Very subtle differences. Is there some sort of rule to go by or should I just memorize these numbers as slightly different for electical furnaces than everything else?