Description: We're putting a little algebra to work to find the full price when you know the discount price in this percent word problem. Created by Sal Khan. Let's say I go to the fruit store today and they have a sale on guavas. So I say, you know what, let me go buy a bunch of guavas. So this is the 30% off sale price on 6 guavas.*Teacher Advisor is 100% free.