The original price of a commodity is 300 yuan, and it is sold at a 20% discount. What is the current price?
一种商品原价300元，按八折出售，现价多少．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">300 * (4/5)</gadget>
<output>240</output>

<result>240</result>