0 (Zero, Nil, Nought)
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If you can completely write a number, using digits, fractions and decimals, then the number is rational. You appear to have accomplished that.
The first prime number after 30 is 31
Call the unknown number x. Also note 30 % = 0.30. Then, 0.30x = 14; x = 14/0.30 = 47, to the justified number of significant digits.
30