Each week, we post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for two free Manhattan Prep GRE Strategy Guides.

The pharmaceutical division’s interest on debt expense is 4 times that of the chemical division. What percent of the chemical division’s payroll expense is the pharmaceutical division’s payroll expense, rounded to the nearest whole percent?

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You may not be aware of the new GRE Diagnostic Service, available to any test takers who have already taken the Revised exam. Did you know that you can actually see how many questions you missed, the difficulty level of each question, how long you spent on each question, and the categories of the problems you missed? (You can’t see the actual questions, though).

Of course, this information is mainly helpful to those who have taken the real exam and intend to take it again. Here’s a screenshot of a small portion of my results:

Of course, we all want to avoid having to retake the real exam. One way to do that is to make sure you are practicing with serious computer-based practice exams. Studying on paper, without time limits, is just not the same!
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