The ballparking answers above are right on! The answer explanation in the
OG has us multiplying by 14.95 and working with nonsense like 807.30 to end up with an answer of 1642.70. The
OG is awesome for sourcing questions, but they only suggest ballparking as the best way to go about things on about 1% of PS questions. By my calculation, ballparking is useful on roughly 12% of PS questions!!! Get good at spotting opportunities to ballpark, and you can get problems correct faster and with less brain damage and fatigue!
ThatDudeKnowsBallparking
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GMAT/GRE Tutor - http://www.thatdudeknows.com
Former GMAT Master Trainer (trained new GMAT instructors) for The Princeton Review.
B-schools couldn't care less about most of the content on the GMAT; the content is just a way to test how you think, not what you know. If you're studying content all the time and not learning testing techniques and psychology, you're missing a huge opportunity.
If you tag @ThatDudeKnows, you'll always get a reply!