The New Century Cinema has 35 rows of seats, each with 38 seats. After the expansion, there will be 40 rows of seats, with 45 seats in each row. How many seats will be added after the expansion?
新世纪电影院有35排座位，每排38个．扩建后将有40排座位，每排有45个．扩建后将增加多少个座位？
<gadget id="calculator">40 * 45</gadget>
<output>1_800</output>

<gadget id="calculator">35 * 38</gadget>
<output>1_330</output>

<gadget id="calculator">1_800 - 1_330</gadget>
<output>470</output>

<result>470</result>