Write SQL query to solve given problem: What is the average percentage of students graduating within 100 percent of normal/expected time for Central Alabama Community College?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT AVG(T2.grad_100_rate) FROM institution_details AS T1 INNER JOIN institution_grads AS T2 ON T2.unitid = T1.unitid WHERE T1.chronname = 'Central Alabama Community College'