There are 3,200 books in the library of Nanhua Primary School, story books account for (1/4) of the total number of books in the collection, and the number of popular science books is (7/4) of story books. How many volumes of popular science books are there?
南华小学图书馆藏书3200册，故事书占藏书总数的(1/4)，科普书册数是故事书的(7/4)，科普书有多少册？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">7 / 4</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">3_200 * (1/4) * (7/4)</gadget>
<output>1_400</output>

<result>1_400</result>