Liangliang took a fancy to a reference book with a price of 7.4 yuan in Xinhua Bookstore, but he only brought 5.6 yuan. The person who went with him obviously had to lend him how much yuan to buy this book.
亮亮在新华书店看中了一本价格为7.4元的工具书，可他只带了5.6元钱，和他一起去的明明要借给他多少元才能买到这本书．
<gadget id="calculator">7.4 - 5.6</gadget>
<output>1.8</output>

<result>1.8</result>