The school plans to distribute story books to 19 classes, 240 for each class, and keep 50 as spares. How many storybooks should schools prepare?
学校准备发故事书给19个班，每班240本，还留下50本作为备用．学校应准备多少本故事书？
<gadget id="calculator">19 * 240</gadget>
<output>4_560</output>

<gadget id="calculator">4_560 + 50</gadget>
<output>4_610</output>

<result>4_610</result>