The marked price of an article is 30% higher than the cost price. If a trader sells the articles allowing 10% discount to customer, then the gain percent will be = ?

\[\begin{gathered} {\text{CP }}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\text{SP }}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\text{ MP}} \hfill \\ 100\,\,\xrightarrow[{{\text{Profit}}}]{}\,\,117\,\,\xleftarrow[{ - 20\% }]{}\,\,\,\,130 \hfill \\ \end{gathered} \]
$$\eqalign{ & {\text{Now profit }}\% \cr & = \frac{{117 - 100}}{{100}} \times 100 \cr & = 17\% \cr} $$