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You multiplied a number with two significant figures by a number with eight significant figures.

How many significant figures do you think the answer can have?

If you said TWO, you were right. It doesn't matter how precise your conversion factor is, if you don't know whether the person really weighed 116 or 124 pounds! So the fact that you only know her weight to two significant figures means that anything you calculate from it will only be accurate to two significant figures.

So how many kg does she weigh, again?