An MP3 is sold at a 20% discount. If the original price of this MP3 is 300 yuan, how much is the current price cheaper than the original price?
一款MP3打八折出售，如果这款MP3原价300元，现价比原价便宜多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">300 * (1/5)</gadget>
<output>60</output>

<result>60</result>