jacket is on sale with a 20% discount. The current price is 40 yuan. What is the original price?
一件上衣八折销售，现价是40元，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>