The original price of a TV is 2,100 yuan, and it is sold at a discount of 15% on holidays. How much is the discount for each TV set?
一台电视机原价2100元，节假日按八五折出售，每台可优惠多少元？
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">1 - (17/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">2_100 * (3/20)</gadget>
<output>315</output>

<result>315</result>