The original price of a TV set is 1,200 yuan, and now it is sold at a 10% discount in the shopping mall. How much is this TV set cheaper than the original price?
一台电视机原价1200元，现在商场打九折出售，这台电视机比原价便宜多少元．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1_200 * (9/10)</gadget>
<output>1_080</output>

<gadget id="calculator">1_200 - 1_080</gadget>
<output>120</output>

<result>120</result>