Study the table and find the value for R.

For Article 1:
Given, Cost Price ($\text{CP}$) = $12600$

The Marked Price ($\text{MP}$) is marked up by $+20\%$ over the Cost Price:

$$\text{MP}=\text{CP}\times \left(1+\frac{20}{100}\right)=12600\times 1.2=15120$$

A discount of $10\%$ is given on the Marked Price to get the Selling Price ($\text{SP}$, which is W):

$$\text{SP}=\text{MP}\times \left(1-\frac{10}{100}\right)=15120\times 0.9=13608$$

Now, we calculate the Profit or Loss percentage ($\text{R}$):

$$\text{Profit}=\text{SP}-\text{CP}=13608-12600=1008$$

$$\text{Profit }\%(\text{R})=\left(\frac{\text{Profit}}{\text{CP}}\right)\times 100\%$$

$$\text{R}=\left(\frac{1008}{12600}\right)\times 100\%=8\%$$