Acme Inc. had 4,900 employees at the beginning of 2021. During the first half of the year, the company had no attrition. Acme continued to hire and had 5,000 employees as of July 1, 2021. However, in the second half of 2021, Acme laid off 500 employees and did not hire any new employees. What was Acme's turnover rate for 2021?

50 percent

25 percent

10 percent

5 percent