Uncle Zhang bought a villa at a price of 4 million yuan last year, and this year he will transfer it to Uncle Li, and the deal was finally sold at 5 million yuan. According to the regulations, 20% of the personal income tax should be paid on the middle price difference. How much yuan will Uncle Zhang get after the transfer?
张叔叔去年以400万元的价格购买了一幢别墅，今年要转让给李叔叔，最后以500万元成交．按规定中间差价应缴纳20%的个人所得税，最终张叔叔转让后得到多少万元？
<gadget id="calculator">500 - 400</gadget>
<output>100</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">100 * (1/5)</gadget>
<output>20</output>

<gadget id="calculator">500 - 20</gadget>
<output>480</output>

<result>480</result>