Due to poor economic conditions, a company had to lay off $20$% of its workforce. When the economy improved, it was able to restore the number of employees to its original number. By what percent was the depleted workforce increased in order to return to the original number of employees?

Assume the original workforce is 100 employees. Laying off 20 percent reduces the workforce to 80 employees. To restore the workforce back to 100 from this depleted level of 80 requires adding 20 employees. The percentage increase is calculated as (Increase / Depleted Base) * 100, which is (20 / 80) * 100, resulting in a 25 percent increase.

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