Li Hong and Zhang Hua have a total of 600 books, and Li Hong's books account for 40% of the total. Later, Li Hong bought some books, accounting for 52% of the total. How many books does Li Hong have?
李红与张华共有图书600本，李红的图书占两人总数的40%．后来李红又买了一些图书，则占两人总数的52%，李红现有多少本图书？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">600 * (3/5)</gadget>
<output>360</output>

<gadget id="calculator">52 / 100</gadget>
<output>13/25 = around 0.52</output>

<gadget id="calculator">1 - (13/25)</gadget>
<output>12/25 = around 0.48</output>

<gadget id="calculator">360 / (12/25)</gadget>
<output>750</output>

<gadget id="calculator">750 * (13/25)</gadget>
<output>390</output>

<result>390</result>