In summer, there was a pair of leather padded shoes in the store. The original price was 940 yuan. In order to increase capital turnover, the shrewd boss decided to sell them at a 50% discount. This way, he could still make a profit of 117 yuan. How much did the pair of leather padded shoes cost?
夏天，商店里有一双皮棉鞋，原售价940元，为了资金周转快，精明的老板决定打五五折销售，这样仍可获利117元，这双皮棉鞋进价多少元？
<gadget id="calculator">55 / 100</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">940 * (11/20)</gadget>
<output>517</output>

<gadget id="calculator">517 - 117</gadget>
<output>400</output>

<result>400</result>