Technically it is 30.40 to 4 s.f. Note that you must explicitly specify the significance of any trailing zeroes to remove any ambiguity.
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14.587020 has eight significant digits. If you were going to round it off to four, the answer would be 14.59
14.587020 rounded to four significant digits is 14.59
The 1st four digits are significant
Four - zeros between significant digits are significant.
111.009 rounded to four significant digits is 111.0