Xinhua Bookstore recently sold 560 story books (1/4) on the first day and 20% on the second day. How many books are left unsold?
新华书店新近560本故事书，第一天卖出了(1/4)，第二天卖出了20%，还剩下多少本没有卖出？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/4) - (1/5)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">560 * (11/20)</gadget>
<output>308</output>

<result>308</result>