The clothing store shipped a batch of casual wear and woolen sweaters, and the number of woolen sweaters was casual wear (1/2). The purchase price of casual wear is 240 yuan each, and the purchase price of woolen sweaters is 160 yuan each. Now increase the price by 12.5% according to the purchase price. When all the casual clothes are sold out and the woolen sweaters are left (1/4), not only will the full cost be recovered, but a profit of 7,000 yuan will also be made. So, how many pieces of casual clothes are shipped from clothing stores?
服装店运来一批休闲装和羊毛衫，其中羊毛衫的数量是休闲装的(1/2)．休闲装的买进价是每件240元，羊毛衫的买进价是每件160元．现在按照买进价加价12.5%，当休闲装全部售完，羊毛衫剩下(1/4)时，不仅收回全部成本，还盈利7000元．那么，服装店运来的休闲装有多少件？
<gadget id="calculator">12.5 / 100</gadget>
<output>0.125</output>

<gadget id="calculator">240 * 0.125</gadget>
<output>30</output>

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

<gadget id="calculator">160 * (1/2) * 0.125</gadget>
<output>10</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">160 * (1/2) * 0.125 * (1/4)</gadget>
<output>2.5</output>

<gadget id="calculator">160 * (1/2) * (1/4)</gadget>
<output>20</output>

<gadget id="calculator">10 - 2.5 - 20</gadget>
<output>-12.5</output>

<gadget id="calculator">30 + (-12.5)</gadget>
<output>17.5</output>

<gadget id="calculator">7_000 / 17.5</gadget>
<output>400</output>

<result>400</result>