It is 25.7 when rounded to 3 significant figures
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30% of 2572= 30% * 2572= 0.3 * 2572= 771.6
There are three of them there.
0.00860 has three significant figures.
635 is already a three significant figure number.
That depends on whether the dot before the question mark is a period or a decimal point. 100 has one significant figure. 100. has three significant figures.