If you want students to practice real world application problems that are related to the concept of percent look no further. Have students scan this AR trigger in the LAYAR app. The 2d image will transform into a 3d video made with Tellagami and exported to You Tube. In the video I tell my students that I have won $2, 000 and I ask them to figure out how much 35 % of $2, 000 is. The kids love this one.