The original price of a mobile phone is 3600 yuan, and now it is sold at a 10% discount. How much is this mobile phone cheaper?
一种手机原价3600元，现在打九折出售，这种手机便宜多少元．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">3_600 * (1/10)</gadget>
<output>360</output>

<result>360</result>