Dad bought an MP3, the original price was 360 yuan, and now he only spent 15% off, how much cheaper than the original price?
爸爸买了一个MP3，原价360元，现在只花了八五折的钱，比原价便宜多少钱？
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">360 * (17/20)</gadget>
<output>306</output>

<gadget id="calculator">360 - 306</gadget>
<output>54</output>

<result>54</result>