Which number is smaller?

Which number is smaller: 420,000 or 420,399?
Hint
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on Tuesday, January 27th, 2009 at 12:03 am and is filed under Problem.
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January 27th, 2009 at 5:02 am
I am a consultant in the data storage industry. When I quote data storage, I have found that rounding up or down to a nice clean number gives the impression that there’s probably room to budge from that number. When I factor in profit margin and leave the final numbers rounded to the nearest dollar if at all, the impression given is that this is the true “best and final” price.