After the price of a commodity is reduced by 20%, the selling price is 16 yuan. What is the original price of this commodity?
一种商品降价20%后，售价是16元，这种商品的原价是多少元．
<gadget id="calculator">20 / 100</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">16 / (4/5)</gadget>
<output>20</output>

<result>20</result>