piece of clothing is 40 yuan cheaper with a 20% discount. How much is the original price of this piece of clothing?
一件衣服，打八折便宜了40元，这件衣服原价多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">40 / (1/5)</gadget>
<output>200</output>

<result>200</result>