The original price of an air conditioner is 2,400 yuan, and now it is being sold at a "65%" discount. How much is the current price cheaper than the original price?
一种空调原价2400元，现在搞促销按"六五"折出售，现价比原价便宜了多少元？
<gadget id="calculator">65 / 100</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">1 - (13/20)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">2_400 * (7/20)</gadget>
<output>840</output>

<result>840</result>