A set of clothing is priced at 500 yuan, and it is sold at a 20% discount due to seasonal changes, so that each set can still make a profit of 25%. How much does this outfit cost per set?
一种服装每套标价500元，因季节变换打八折出售，这样每套仍能获利25%．这种服装每套成本多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(4/5) / (5/4)</gadget>
<output>16/25 = around 0.64</output>

<gadget id="calculator">500 * (16/25)</gadget>
<output>320</output>

<result>320</result>