The bookstore shipped a batch of story books, sold 100 copies on the first day, accounting for 20% of the total, and sold (2/5) of the total number on the second day, how many copies were sold on the second day?
书店运来一批故事书，第一天卖出100本，占总数的20%，第二天卖出总数的(2/5)，第二天卖出多少本？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">100 / (1/5)</gadget>
<output>500</output>

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

<gadget id="calculator">500 * (2/5)</gadget>
<output>200</output>

<result>200</result>