0011001 in base 2 = 49 in base 10
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You didn't explicitly say so, but we suspect that "0011001" is a binary number. In that case, its decimal equivalent is 25 .
0.3 is a already written as a decimal. It is the decimal version of 3/10ths.
The value is the same, the whole number ( to the left of the decimal point ) is the same, but the fraction of 1 ( to the right of the decimal point) can be expressed as either a fraction or a decimal depending on its use, so for example: 1.375 is the same as 1 3/8
It is 3184.56
This already is a decimal. If this does not answer your question, please submit another question stating what you need.