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.