In order to promote sportswear, a shopping mall first increases the price by 50% of the purchase price, and then advertises a 20% price reduction. As a result, each sportswear still makes a profit of 20 yuan. What is the purchase price of each sportswear?
某商场为了促销运动衣，先按进价的50%加价后，又宣传降价20%，结果每件运动衣仍获利20元，每件运动衣的进价是多少元．
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) * (1/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/2) - (1/5) - (1/10) - 1</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">20 / (1/5)</gadget>
<output>100</output>

<result>100</result>