If it is shown at the punishment phase of a trial for the manufacture of a controlled substance listed in Penalty Group 1 that when the offense was committed a child younger than 18 years of age was present on the premises where the offense was committed:
(1) the punishments specified by Sections 481.112(b) and (c) are increased by one degree;
(2) the minimum term of imprisonment specified by Section 481.112(e) is increased to 15 years and the maximum fine specified by that section is increased to $150,000; and
(3) the minimum term of imprisonment specified by Section 481.112(f) is increased to 20 years and the maximum fine specified by that section is increased to $300,000.