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The Percent Trick

Whenever you’re dealing with percent change in a math problem, there’s a two-step method to solving the question. What’s better than two steps? One step! In the video below, I show you the “percent trick” that can make percent change problems super straightforward. Bonus: This trick is also useful in real life, especially when you want to calculate sales tax, interest payments, discounts, and more.

This problem comes from the ACT Math test, but this strategy applies just as well to SAT Math questions. Make sure you try the problem yourself first before viewing my solution. Here it is:


You can find this problem on the ACT’s website here.

About the Author:

I’m Rob Schombs, the founder of Reason Prep, creator of these videos, and your test prep tutor. I earned a BA in Chemistry (2006) and an MA in Science and Technology Studies (2009) from Cornell University. In 2010 I started tutoring SAT, ACT, math, chemistry, and writing full-time, and Reason Prep followed shortly after!