There are 8 classes in the third grade of Chengguan Primary School, each class has 45 students, and the fourth grade has 20 more students than the third grade. How many students are there in the fourth grade of Chengguan Primary School?
城关小学三年级有8个班，每个班有学生45人，四年级比三年级多20人．城关小学四年级有多少人？
<gadget id="calculator">45 * 8</gadget>
<output>360</output>

<gadget id="calculator">360 + 20</gadget>
<output>380</output>

<result>380</result>