A product is sold at 20% off the original price, and the price is 21.20 yuan, what is the original price?
某商品按原价的8折出售，售价为21.20元，则原价为多少．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">21.2 / (4/5)</gadget>
<output>26.5</output>

<result>26.5</result>