It is then 30,000 rounded to 1 significant figure
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When expressing a number to one significant figure, you look at the first non-zero digit from the left. In this case, the first non-zero digit is 2. The number 25446 to one significant figure would be 20000, as you round to the nearest power of 10 based on the significant figure.
Rounded to 1 significant figure it is 0.4
0.00009893 to 1 significant figure = 0.0001
6694 rounded to 1 significant figure is 7000
99.6 rounded to 1 significant figure is 100
6,256 rounded to 1 significant figure is 6,000