A toy is now sold for 40 yuan each, which is 20% lower than before. How much was each piece sold in the past?
一种玩具，现在每件卖40元，比原来降低了20%，原来每件卖多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">40 / (4/5)</gadget>
<output>50</output>

<result>50</result>