The original price of a piece of clothing is 200 yuan, and the price is first reduced by 30%, and then the price is reduced by 20%, how much cheaper it is to buy this dress back.
一件衣服原价200元，先降价30%，再降价20%，买回这件衣服可便宜多少元．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">200 * (7/10) * (4/5)</gadget>
<output>112</output>

<gadget id="calculator">200 - 112</gadget>
<output>88</output>

<result>88</result>