According to the regulations, 800 yuan is deducted from the manuscript fee income, and the remaining part of the manuscript fee not exceeding 4,000 yuan is subject to personal income tax at a rate of 10%; the part exceeding 4,000 yuan is subject to a 15% tax rate. Personal income tax is paid after writing the book and getting the remuneration With a personal income tax of 490 yuan, how much did he get for writing a book?
按规定稿费收入扣除800元，剩下的稿费不超过4000元的部分，按照10%的税率缴纳个人所得税；超过4000元的部分按照15%的税率缴纳个人所得税，王老师写书得到稿酬后缴纳了490元个人所得税，他写书得到多少稿酬？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">4_000 * (1/10)</gadget>
<output>400</output>

<gadget id="calculator">490 - 400</gadget>
<output>90</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">90 / (3/20)</gadget>
<output>600</output>

<gadget id="calculator">600 + 4_000 + 800</gadget>
<output>5_400</output>

<result>5_400</result>