A pair of sports shoes is 120 yuan, and it is now on sale at a 30% discount. How much cheaper than the original?
一双运动鞋120元，现在打七折出售．比原来便宜多少元？
<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>

<gadget id="calculator">120 * (3/10)</gadget>
<output>36</output>

<result>36</result>