What are these two numbers after being rounded off

[From: ] [author: ] [Date: 12-09-11] [Hit: ]

532,800-24.4704=24.143.532,800=533,......

Round off to three significant figures.

what is 24.4704 rounded
143.63212
532,800

24.4704=24.5
143.63212=144
532,800=533,000

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