A custom duty of Rs. 720 is charged for a certain item that is imported. Find the percentage ofduty, if the value of this item is Rs. 9 000.

To find the percentage of duty, you need to follow these steps:

1. First, identify the total cost of the item and the custom duty charged. From the question, we know that the total cost of the item is Rs. 9,000 and the custom duty charged is Rs. 720.

2. Next, you need to divide the custom duty by the total cost of the item. So, you would divide Rs. 720 by Rs. 9,000. This will give you the decimal representation of the duty percentage.

3. To convert this decimal to a percentage, you multiply by 100.

Let's do the calculation:

720 ÷ 9000 = 0.08

0.08 x 100 = 8%

So, the custom duty is 8% of the value of the item.