It costs 43.9 yuan to buy 5 notebooks and 12 pens. Given that each pen is 3.2 yuan, how much is each notebook.
买5个本子和12支笔共花43.9元，已知每支笔3.2元，求每个本子多少元．
<gadget id="calculator">3.2 * 12</gadget>
<output>38.4</output>

<gadget id="calculator">43.9 - 38.4</gadget>
<output>5.5</output>

<gadget id="calculator">5.5 / 5</gadget>
<output>1.1</output>

<result>1.1</result>