A small school employs 555 teachers who make between \$40{,}000$40,000dollar sign, 40, comma, 000 and \$70{,}000$70,000dollar sign, 70, comma, 000 per year. The newest teacher, Valerie, decides to teach part-time which decreases her salary from \$40{,}000$40,000dollar sign, 40, comma, 000 to \$20{,}000$20,000dollar sign, 20, comma, 000 per year. The rest of the salaries stay the same.
How will decreasing Valerie's salary affect the mean and median?