At what percent above the cost price, must a shop keeper marks his goods so that he gains 20% even after giving a discount of 10% on the marked price?

• A. 25%
• B. 30%
• C. <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>
• D. <table><tr><td rowspan="2">37</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>
• E.