During the discount promotion in the mall, Aunt Wang bought a jacket and a pair of trousers for a total of 420 yuan. The jacket was 40% off the list price, and the pants were 40% off the list price. The jacket was 500 yuan. What is the price of the pants?
商场打折促销时，王阿姨买了一件上衣和一条裤子共用了420元，其中上衣按标价打六折，裤子按标价打四折，上衣标价500元，裤子的标价是多少元？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">500 * (3/5)</gadget>
<output>300</output>

<gadget id="calculator">420 - 300</gadget>
<output>120</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">120 / (2/5)</gadget>
<output>300</output>

<result>300</result>