To find what percentage Rs. 329 is of Rs. 6580, you can use the formula:
\[ \text{Percentage} = \left( \frac{\text{Part}}{\text{Whole}} \right) \times 100 \]
In this case, the "Part" is Rs. 329, and the "Whole" is Rs. 6580.
\[ \text{Percentage} = \left( \frac{329}{6580} \right) \times 100 \]
Calculating this:
\[ \text{Percentage} = \left( 0.05 \right) \times 100 = 5 \]
So, Rs. 329 is 5% of Rs. 6580.