Xinhua Bookstore shipped a batch of books, sold 32% of the books on the first day, and sold 45% of the books on the second day. It is known that 640 copies were sold on the first day. How many more copies did you sell on the second day than on the first day?
新华书店运到一批图书，第一天卖出这批图书的32%，第二天卖出这批图书的45%．已知第一天卖出640本．第二天比第一天多卖出多少本？
<gadget id="calculator">32 / 100</gadget>
<output>8/25 = around 0.32</output>

<gadget id="calculator">640 / (8/25)</gadget>
<output>2_000</output>

<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(9/20) - (8/25)</gadget>
<output>13/100 = around 0.13</output>

<gadget id="calculator">2_000 * (13/100)</gadget>
<output>260</output>

<result>260</result>