A shopping mall increases the price of sportswear by 50% of the purchase price, and writes "big bargain, 20% discount". As a result, each sportswear still makes a profit of 20 yuan. What is the purchase price of sportswear?
某商场将运动衣按进价的50%加价后，写上"大酬宾，八折优惠"，结果每件运动衣仍获利20元，运动衣的进价是多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (4/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) - 1</gadget>
<output>-3/5 = around -0.6</output>

<gadget id="calculator">(4/5) + (-3/5)</gadget>
<output>1/5 = around 0.2</output>

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

<result>100</result>