A store increases the price of a certain clothing by 40% of the cost price, and sells it at a discount of 20% (80% of the price), resulting in a profit of 15 yuan per piece. How much does this clothing cost?
一家商店将某种服装按成本价提高40%定价，又以八折(定价的80%)优惠卖出，结果每件获利15元．这种服装的成本是多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * (4/5)</gadget>
<output>8/25 = around 0.32</output>

<gadget id="calculator">(8/25) - 1</gadget>
<output>-17/25 = around -0.68</output>

<gadget id="calculator">(4/5) + (-17/25)</gadget>
<output>3/25 = around 0.12</output>

<gadget id="calculator">15 / (3/25)</gadget>
<output>125</output>

<result>125</result>