Feedback on that specific presentation and in general:
-Some visuals used 10% growth, others 7%. Unless there is a stated or implicitly obvious reason for doing so, I'd keep the rates the same when showing "the basics". Also, people who are beginners are often risk-averse and think anything like Dave Ramsey's 12% is either a) too-good-to-be-true and/or b) a scam of some type. The 10% number is close to that territory. Yes, there are some growth rates in that vicinity but often they are nominal and not real. This is just me, but I like lower %s (like 5, 6, or 7%) to use in illustrations that still drive the point home and seem more legitimate/attainable to the average idiot.
-Simple math is okay. Grade school kids can be taught the Rule of 72.
-Be sure to talk about spending! The MMM graph that hooked me was time to retirement not based on how much you put away but rather just the percentage. It was embarrassing to not have thought about it that way myself. I liked that above some reasonable low end threshold for living expenses, it IS possible to retire while not raking in a high salary. The person who makes 400k and saves 40k is worse off with respect to retirement than the person making 60k and saving 10k. I think that's a lesson every kid in high school should learn and really understand the mechanism of how that is true. I think when financially illiterate people realize that they CAN save some amount of money and that it DOES add up to a decent amount over time irrespective of their salary/career prestige/whatever, they change their behavior. If they keep their head buried in the sand, they figure the pittance they put away wouldn't make a difference so why not spend it today (if the thought process even goes that far).
-When your co-workers are then so amped up to save money (one can dream), then you introduce some of the jargon involved with the various investment vehicle to choose from at your specific place of employment. That is, don't talk about abbreviations or finance terms until the end when your co-workers' interest is piqued and they actually might want to learn more about how to save and what their options are. I'd wager your co-workers know what compound interest is and how it works so don't overly patronize on that front. I think it can be a major mental block when it comes to the how and where of investing (i.e. crippling uncertainty) rather than the "what it even is" aspect (i.e. ignorance).
