The Math of Percentages and Discounts Explained in Three Animated Acts

Includes animated videos

Part I: The Basics

Quick shopping quiz:

That $130 pair of shoes you’ve been eyeing for weeks is now marked down 20 percent. To sweeten the deal, you have a coupon for 10 percent off your entire purchase. In other words, you’re looking at a discount of: 10% off 20% off $130.

So … how much would you end up paying?

Percentages. You can run, you can hide … but they’ll find you.

From sports to the news, to — most importantly — shopping, they are pretty hard to avoid. And if you’re among the 80 percent of our population who doesn’t really understand the math behind percentages (OK, so maybe I just made that percentage up), then you’re missing out on a whole bunch of important information (fabulous shopping discounts included). In these three short videos, animator and explainer extraordinaire Josh Kurz, breaks down the basic math behind common percentage conundrums.

Part II: The Math of Discounts (or, Finding A Good Deal)


Part III: Combining Percentages (or, Finding A Good Deal)

Josh Kurz started out as an embryo, 53 times smaller than a US nickel. Born and raised in Brooklyn, New York, he began at an early age fusing the abstract concepts of science and comedy. Now he works as an independent filmmaker specializing in humorous science explainers ranging from the economics of voting to why some people (like he himself) hate cilantro. His work has been featured on WGBH, ABC, PBS, NPR, TEDed, and Radiolab.