How many significant figures are in 20 percent
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How many significant figures are in 20 percent

[From: ] [author: ] [Date: 12-01-08] [Hit: ]
I am unsure whether there are 1 or 2 sig figs in 20% & whether 20% is considered 0.2 or 0.20.(After all, I cant find the right answer if I dont know the correct number of significant figures in my answer.Thanks!......
Just for reference, the question is,

What partial pressure of oxygen is a scuba diver breathing if the total pressure is 6.3 atm and 20 percent of the air is oxygen?

I understand the question and how to solve it and all that
BUT
I am unsure whether there are 1 or 2 sig figs in 20% & whether 20% is considered 0.2 or 0.20.

(After all, I can't find the right answer if I don't know the correct number of significant figures in my answer.)

Thanks!

-
1 significant figure in 20%
it is 0.2 if you put it in decimal form.

It can also be 2 significant figure if you place a decimal after the zero so be careful with that.
20.% = 2 sig fig
20% = 1 sig fig
1
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