Aunt Wang in the clothing market bought 80 pairs of the same kind of pants, and the selling price was 20% higher than the buying price, and she made a profit of 400 yuan. How much was the price of each pair of these trousers when you purchased them?
服装市场的王阿姨购进80条同一种裤子，卖出的价格比购进的价格贵20%，结果赚了400元．这批裤子购进时每条价格是多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">400 / 80 / (1/5)</gadget>
<output>25</output>

<result>25</result>