A piece of clothing costs 200 yuan and is sold at a 30% discount. How much is it cheaper?
一件衣服200元，打7折出售，便宜了多少钱．
<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">200 * (3/10)</gadget>
<output>60</output>

<result>60</result>