There are 3,600 science and technology books in the library of Patriotic Primary School, and the number of story books is 15% less than that of science and technology books. How many story books are there?
爱国小学图书馆有科技书3600本，故事书比科技书少15%．有故事书多少本？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">3_600 * (17/20)</gadget>
<output>3_060</output>

<result>3_060</result>