Adding 1.5 yuan to Xiaoming's existing money, he can just buy a book for 3.75 yuan and a pencil for 0.3 yuan. But now he only bought a book worth 2 yuan, how much money is left?
小明现有的钱再添1.5元，正好可以买一本3.75元的书和一枝0.3元的铅笔．但他现在只买了一本2元的书，还剩下多少元？
<gadget id="calculator">2.45 - 2</gadget>
<output>0.45</output>

<result>0.45</result>