Write SQL query to solve given problem: List all the pay rates of all employees that were hired at 20 years of age.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T2.Rate FROM Employee AS T1 INNER JOIN EmployeePayHistory AS T2 ON T1.BusinessEntityID = T2.BusinessEntityID WHERE STRFTIME('%Y', T1.HireDate) - STRFTIME('%Y', T1.BirthDate) = 20