Xiaohong buys 8 notebooks, pays 20 yuan, and gets back 0.64 yuan. How much is each notebook?
小红买8本笔记本，付出20元，找回0.64元，每本笔记本多少钱？
<gadget id="calculator">20 - 0.64</gadget>
<output>19.36</output>

<gadget id="calculator">19.36 / 8</gadget>
<output>2.42</output>

<result>2.42</result>