A pair of pants is priced at 165 yuan, sold at 80% of the price, and the profit margin is 20%. How much is the cost of these trousers?
一条裤子标价165元，按标价的80%出售，利润率还有20%．这条裤子的成本价是多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(4/5) / (6/5)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">165 * (2/3)</gadget>
<output>110</output>

<result>110</result>