This is a great example of a problem that tries to lure us into doing more math than we have to!
The question: We’re dealing with the same principal invested in two different funds, X and Y, for the same time period. In order to compare the interest earned, we’ll need to know the interest rate for each fund and how it’s compounded over the three year period. Keep in mind that this is a Yes/No question, so we don’t actually need to calculate the amount of interest earned — we just need to know that we could.
Statement 1: A tempting trap. Knowing the amount of interest earned makes it seem like we could calculate an interest rate. But this is only for the first year. It’s possible that the model could change in years two and three.
Insufficient.Statement 2: Here, we’re told the annual interest rate for each fund and how it’s compounded. That will be enough to calculate a comparison of interest earned between the funds — though we shouldn’t actually do that math!
Sufficient.With Statement 2 alone sufficient, the correct answer is
B. If you’re interested in a deeper dive into Data Sufficiency best practices, ManhattanPrep offers a free trial class that covers the fundamental strategies to help you crack this challenging format!
-Ally Bell
ManhattanPrep GMAT Instructor