The original price of a computer is 5,400 yuan, and now it is sold at 10% off the original price, how much is the price reduced?
一台电脑的原价是5400元，现在按原价的九折出售，则降价了多少元？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">5_400 * (9/10)</gadget>
<output>4_860</output>

<gadget id="calculator">5_400 - 4_860</gadget>
<output>540</output>

<result>540</result>