6. a. If a person is required to install an ignition interlock device and that person's family income does not exceed 100% of the federal poverty level, the monthly leasing fee shall be 50% of the fee established by regulation for persons who do not qualify for the reduced fee.
b. If a person is required to install an ignition interlock device and that person's family income does not exceed 149% of the federal poverty level, the monthly leasing fee shall be 75% of the fee established by regulation for persons who do not qualify for the reduced fee.
c. Persons who qualify for a reduced fee pursuant to the provisions of this section shall not be required to pay the installation fee, the cost for monitoring of the device, or any fees for calibration or removal of the device.