When redeeming prizes in the lottery, it is stipulated that personal income tax should be paid on the basis of 20% of the winning amount for prizes exceeding 10,000 yuan. Uncle Wang was lucky enough to win a huge prize of 5 million yuan. How much is the tax he should pay?
彩票兑奖时规定，超过一万元的奖金要按获奖额的20%缴纳个人所得税，王叔叔幸运地中了500万元的巨奖．他应缴纳的税款是多少万元？
<gadget id="calculator">500 - 1</gadget>
<output>499</output>

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

<gadget id="calculator">499 * (1/5)</gadget>
<output>499/5 = around 99.8</output>

<result>499/5 = around 99.8</result>