When Xiao Ming buys a notebook, he puts the wrong decimal point when recording the expenses, which is 4.05 yuan more than the actual amount. Do you know how much the notebook actually costs?
小明买笔记本，在记录花费时把小数点点错了，比实际多了4.05元．你知道笔记本实际是多少元吗？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">4.05 / 9</gadget>
<output>0.45</output>

<result>0.45</result>