On the first day of the winter vacation, Xiao Ming went to Xinhua Bookstore to buy two books. The total cost was 20.8 yuan, of which "Popular Science Encyclopedia" cost 4.8 yuan. Do you know how much the other book cost?
放寒假的第一天，小明到新华书店买了两本书，共花了20.8元，其中《科普百科》花了4.8元，你知道另一本书花了多少钱吗？
<gadget id="calculator">20.8 - 4.8</gadget>
<output>16</output>

<result>16</result>