Licun Primary School organized students to donate books to the school library. There were 203 students in the fourth grade, with an average of 3 books per person, and 230 students in the fifth grade, with an average of 4 books per person. How much more did the fifth grade donate than the fourth grade? book?
李村小学组织同学们为学校图书馆捐书，四年级有203人，平均每人捐3本书，五年级有230人，平均每人捐4本书，五年级比四年级多捐了多少本书？
<gadget id="calculator">230 * 4</gadget>
<output>920</output>

<gadget id="calculator">203 * 3</gadget>
<output>609</output>

<gadget id="calculator">920 - 609</gadget>
<output>311</output>

<result>311</result>