I would put 3.29 so that there are no questions or bad impressions.
Applicants always try to make their applications look and sound better than they really are and the adcoms are always engaged in untangling and deconstructing these things, so even a small round-up may leave a bad taste. I would not think it is ding-worthy but why risk?
Founder of GMAT Club
Just starting out with GMAT? Start here... | Want to know your GMAT Score? Try GMAT Score Estimator
Need GMAT Book Recommendations? Best GMAT Books
Co-author of the GMAT Club tests
Have a blog? Feature it on GMAT Club!
Get the best GMAT Prep Resources with GMAT Club Premium Membership