The original price of a suit is 120 yuan, and it is sold at a 15% discount. How much is this suit cheaper than the original one?
一件衣服西服原价120元，打八五折出售，这件西服比原来便宜多少元．
<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">120 * (3/20)</gadget>
<output>18</output>

<result>18</result>