Teacher Zhang distributes exercise books to 15 classes in the school. Each class is divided into 144 books, and 40 books are left as spares. How many exercise books did the school buy in total?
张老师给全校15个班级分发练习本，每个班分144本，还剩40本做为备用．学校一共买来多少本练习本？
<gadget id="calculator">15 * 144</gadget>
<output>2_160</output>

<gadget id="calculator">2_160 + 40</gadget>
<output>2_200</output>

<result>2_200</result>