At the beginning of the semester, $40\%$ of all employees at Tech Solutions Inc. reported being "Highly Satisfied" with their job, and $60\%$ reported being "Moderately Satisfied" or "Dissatisfied." At the end of the semester, $80\%$ reported being "Highly Satisfied" and $20\%$ reported being "Moderately Satisfied" or "Dissatisfied." Altogether, $x\%$ of the employees gave a different answer at the beginning and end of the semester. What is the difference between the maximum and the minimum possible values of $x$?