set of clothes is sold at 20% off, which is 400 yuan cheaper than before. How much is the current price of this suit?
一套衣服按八折出售比原来便宜了400元，这套衣服现在的售价是多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">400 / (1/5)</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 - 400</gadget>
<output>1_600</output>

<result>1_600</result>