The original price of a TV set is 2,300 yuan, and it is sold at a 30% discount after the discount. How much is the current price cheaper than the original price?
一台电视机原价2300元，打折后按7折出售，现价比原价便宜多少元？
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">2_300 * (7/10)</gadget>
<output>1_610</output>

<gadget id="calculator">2_300 - 1_610</gadget>
<output>690</output>

<result>690</result>