The original price of a TV set is 4,500 yuan, and there is a 10% discount during the "October" festival. How much can you save by buying such a TV set?
一台电视机原价4500元，"十一"节期间九折优惠，买一台这样的电视机能节省多少元．
<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">4_500 * (1/10)</gadget>
<output>450</output>

<result>450</result>