The original price of a commodity is 120 yuan, and it is sold at a "30% discount". How much is the actual price discounted from the original price?
一种商品原价120元，打"七折"出售，实际售价比原价优惠了多少元．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">120 * (7/10)</gadget>
<output>84</output>

<gadget id="calculator">120 - 84</gadget>
<output>36</output>

<result>36</result>