By selling 60 articles a vendor gains the selling price of 15 articles. Find his gain percentage.

• A. 25 %
• B. <table><tr><td rowspan="2">33</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2">%</td></tr><td align="center">3</td></table>
• C. 20%
• D. <table><tr><td rowspan="2">28</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>4</center></td><td rowspan="2">%</td></tr><td align="center">7</td></table>