If the ratio of the cost price and the selling price of an article be 4 : 5, then the percentage of profit is :

• A. <table><tr><td rowspan="2"> 27</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">2</td></table>
• B. 25
• C. 15
• D. 10