Xiaoli brought 80 yuan to the bookstore to buy books. It happened that the bookstore was on sale. The series of "Encyclopedia of Knowledge" was 25% off, and the price was only 18.4 yuan per book. Xiaoli bought a set of 4 "Encyclopedia Knowledge" series books, and bought 2 notebooks with the remaining money. How much is each notebook?
小丽带80元到书店买书，刚巧碰上书店促销，《百科知识》丛书打七五折，只售18.4元/本．小丽买了一套4本的《百科知识》丛书，又剩下的钱买了2个笔记本，每个笔记本多少元？
<gadget id="calculator">18.4 * 4</gadget>
<output>73.6</output>

<gadget id="calculator">80 - 73.6</gadget>
<output>6.4</output>

<gadget id="calculator">6.4 / 2</gadget>
<output>3.2</output>

<result>3.2</result>