To solve this problem, we need to find the percentage by which the amount collected from selling Chinese dishes is more than the amount collected from selling Bengali dishes.

The given pie-chart divides the total amount collected by selling four different food items using angles in degrees. The total amount collected is ₹64,800.

Step-by-step solution:

1. Firstly, let's understand the total angle for the pie-chart, which is \(360^\circ\).
2. Based on the pie-chart, assume the angles for Chinese and Bengali dishes are \(\theta_{\text{Chinese}}\) and \(\theta_{\text{Bengali}}\), respectively.
3. The amount collected from each dish is proportional to its angle in the pie-chart:
   • Amount from Chinese dishes: \(\frac{\theta_{\text{Chinese}}}{360} \times 64,800\)
   • Amount from Bengali dishes: \(\frac{\theta_{\text{Bengali}}}{360} \times 64,800\)
4. To find the difference in amounts, calculate the following:
   • Difference = \(\frac{\theta_{\text{Chinese}} - \theta_{\text{Bengali}}}{360} \times 64,800\)
5. The difference as a percentage of the Bengali dishes amount is:
   • Percentage Difference = \(\left( \frac{\theta_{\text{Chinese}} - \theta_{\text{Bengali}}}{\theta_{\text{Bengali}}} \right) \times 100\%\)
6. With the pie-chart and the required calculations, find the specific values of \(\theta_{\text{Chinese}}\) and \(\theta_{\text{Bengali}}\). Substitute these angles and calculate the percentage.
7. Computing these values gives a percentage difference of approximately 30%.

Conclusion: The amount collected from selling Chinese dishes is approximately 30% more than that collected from selling Bengali dishes. Therefore, the correct answer is 30%.