A kind of children's clothing is 200 yuan, and it is sold at a 15% discount on the "June 1st" festival. How much is it cheaper?
一种儿童服装200元，"六一"节打八五折出售，便宜了多少元？
<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">200 * (3/20)</gadget>
<output>30</output>

<result>30</result>