A set of sportswear is sold for 40 yuan after a 20% discount. What is the original price of this set of sportswear?
一套运动服打八折后卖40元，这套运动服的原价是多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

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

<result>50</result>