15 years ago, the average age of all the 40 employees of a college was 50 years, 8 years ago, the manager had retired from his post at the age of 60 years. So, after one year a new manager whose age was 56 years, recruited from outside. Find the present average age of all the employees, if the manager is also considered as an employee.
1
\(54 \frac{7}{8}\) year
2
\(56 \frac{3}{5}\) year
3
\(64 \frac{7}{8}\) year
4
\(64 \frac{3}{5}\) year