Last year the price per share of Stock X increased by *k* percent and the earnings per share of Stock X increased by *m* percent, where *k* is greater than *m*. By what percent did the ratio of price per share to earnings per share increase, in terms of *k* and *m*?

A. *k*/*m* %

B. (*k*–*m*) %

C. 100(*k*–*m*) / (100+*k*) %

D. 100(*k*–*m*) / (100+*m*) %

E. 100(*k*–*m*) / (100+*k*+*m*) %

**Correct Answer:** D

Full explanation coming soon. Send us a note if you’d like this added to the express queue!

You’ll find tons of practice questions, explanations for GMAT Official Guide questions, and strategies on our GMAT Question of the Day page.

## Here are a few other extra challenging GMAT questions with in depth explanations:

Here’s a tough function question from the GMAT Prep tests 1 and 2:

For which of the following functions is f(a+b) = f(b) + f(a) for all positive numbers a and b?

And a very challenging word problem from the Official Guide. Almost no-one gets this one on the first try but there is a somewhat simple way through it:

Tanya’s letters from the GMAT Prep tests. This one often gets GMAT tutoring students caught up in a tangled net. With combinatorics it’s important to stay practical. We’ll take a look at how to do that in the explanation:

Here’s an exponents puzzle that comes up a lot in GMAT tutoring sessions:

This is one of the most difficult questions in the GMAT universe. That said, there is a simple way to solve it that relies on a fundamental divisibility rule every GMAT studier should know:

## Learn more about GMAT tutoring with Atlantic

### GMAT Question of the Day Signup

Sign up for 1 challenging GMAT question sent to you each week.