A shopping mall increases the price of a summer dress by 80% of the purchase price during the season-changing promotion, and then gives a 30% discount for big bargains. As a result, each dress still makes a profit of 52 yuan. What is the purchase price of the summer dress?
某商场在换季促销时，将一种夏装按进价的80%加价，再大酬宾7折优惠，结果每件衣服仍然获利52元，该夏装的进价是多少元．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(7/10) * (4/5)</gadget>
<output>14/25 = around 0.56</output>

<gadget id="calculator">(14/25) - 1</gadget>
<output>-11/25 = around -0.44</output>

<gadget id="calculator">(7/10) + (-11/25)</gadget>
<output>13/50 = around 0.26</output>

<gadget id="calculator">52 / (13/50)</gadget>
<output>200</output>

<result>200</result>