large enough to be noticed or have an effect
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To find a number to two significant figures or any amount of significant figures you look at one plus the amount of asked figures, in this case the third significant figure, and if it is 5 or greater increase the asked amount of significant figures by one. If it is 4 or less make no changes to your number. Finally report the calculated number with the asked amount of significant figures.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
The sig fig is 5: in significant figures, the amount is 5 hundred million.
No, the one with the least.
29.1% if you want it to the right amount of significant figures