Mom bought an MP4, the original price was 600 yuan, and now it only costs 15% off, how much is the current price?
妈妈买了一个MP4，原价600元，现在只花了八五折的钱，现价是多少钱？
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">600 * (17/20)</gadget>
<output>510</output>

<result>510</result>