The price of a piece of clothing is reduced by 1/5, and the price is 100 yuan. How much is the original price of this piece of clothing?
一件衣服降价(1/5)，售价100元，这件衣服原价多少元？
<gadget id="calculator">1 / 5</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">100 / (4/5)</gadget>
<output>125</output>

<result>125</result>