A product is sold at a 20% discount and the current price is 100 yuan. What is the original price?
某商品打八折出售现价100元，原价为多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">100 / (4/5)</gadget>
<output>125</output>

<result>125</result>