We need to calculate the percentage of Ex-Defence Servicemen at each organizational level. The formula is:
\[
\text{Percentage} = \frac{\text{Ex-Defence Servicemen at that level}}{\text{Total Employees at that level}} \times 100
\]
Step 1: Level 1
Total Employees = 52, Ex-Defence Servicemen = 6
\[
\frac{6}{52} \times 100 = 11.54%
\]
Step 2: Level 2
Total Employees = 65, Ex-Defence Servicemen = 8
\[
\frac{8}{65} \times 100 = 12.31%
\]
Step 3: Level 3
Total Employees = 210, Ex-Defence Servicemen = 30
\[
\frac{30}{210} \times 100 = 14.28%
\]
Step 4: Level 4
Total Employees = 130, Ex-Defence Servicemen = 25
\[
\frac{25}{130} \times 100 = 19.23%
\]
Step 5: Level 5
Total Employees = 330, Ex-Defence Servicemen = 60
\[
\frac{60}{330} \times 100 = 18.18%
\]
Step 6: Comparison
\[
\text{Level 1: } 11.54%, \quad
\text{Level 2: } 12.31%, \quad
\text{Level 3: } 14.28%, \quad
\text{Level 4: } 19.23%, \quad
\text{Level 5: } 18.18%
\]
Clearly, the maximum percentage is at
Level 4 = 19.23%.
\[
\boxed{\text{Level 4 has the highest percentage of Ex-Defence Servicemen.}}
\]