The original price of a TV set is 2,500 yuan, and it is now on sale at a discount of 30%. The current price is much cheaper than the original price.
一台电视机原价2500元，现打七折出售，现价比原价便宜多少．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>