On selling an article for Rs. 105, a trader loses 9%. At how much should he sell the article to gain 30%?

Explanation

To solve the problem, we need to find the cost price (CP) of the article first, and then determine the selling price (SP) required to achieve a 30% gain.

### Step 1: Determine the Cost Price (CP)
We know that when the article is sold for Rs. 105, the trader incurs a loss of 9%.

The formula for loss is:
\[
\text{Loss} = \text{Cost Price} - \text{Selling Price}
...