The original price of a commodity is 80 yuan, and now it is 20% off. What is the current price?
一种商品原价80元，现在打八折，现价是多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">80 * (4/5)</gadget>
<output>64</output>

<result>64</result>