In this section, “disposable wages” means the part of wages that remain after deduction of any amount required to be withheld by law. The following are exempt from attachment: The greater of: 75 percent of the disposable wages due; or 30 times the State minimum hourly wage in effect at the time the wages are due, multiplied by the number of weeks during which the wages due were earned; and Any medical insurance payment deducted from an employee’s wages by the employer. The amount subject to attachment shall be calculated per pay period.