A product is sold at 50 yuan after a 20% discount. What is the original price?
一件商品打八折后按50元售出，原价是多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">50 / (4/5)</gadget>
<output>125/2 = around 62.5</output>

<result>125/2 = around 62.5</result>