The original price of an LCD TV is 5,400 yuan. If it is sold at a 10% discount, how much is it cheaper than before?
一台液晶电视原来售价5400元，若打九折出售，比原来便宜多少钱？
<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">5_400 * (1/10)</gadget>
<output>540</output>

<result>540</result>