A bookstore shipped 36 books, sold (1/2) of the total on the first day, and sold (4/9) of the first day on the second day, how many books were sold on the second day?
一个书店运来36本图书，第一天卖出总数的(1/2)，第二天卖出的是第一天的(4/9)，第二天卖出多少本？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(1/2) * (4/9)</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">36 * (2/9)</gadget>
<output>8</output>

<result>8</result>