The state stipulates that personal income adjustment tax shall be paid on the manuscript fees obtained by individuals publishing articles and books, and the part exceeding 800 yuan shall be taxed at 8%, and the part not exceeding 800 yuan shall not be taxed. Professor Wang received a manuscript fee for publishing a book, and he paid a tax of 392 yuan. How much is the manuscript fee for Professor Wang?
国家规定，个人发表文章，出版著作所获得的稿费需激纳个人收入调节税，超过800元的部分按8%激纳，不高于800元的不纳税．王教授出版一本著作获得一笔稿费，他激纳了392元的税，王教授的这笔稿费是多少元？
<gadget id="calculator">8 / 100</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">392 / (2/25)</gadget>
<output>4_900</output>

<gadget id="calculator">4_900 + 800</gadget>
<output>5_700</output>

<result>5_700</result>