A conference hall plans to pave the floor with 900 square bricks with a side length of 80cm, which is 45 yuan per square brick, and other costs for laying square bricks are 3,400 yuan. How much does it cost to pave this conference hall?
一个会议厅计划铺地砖，用900块边长80cm的方砖刚好铺满，方砖每块45元，铺方砖的其他费用需3400元．铺好这个会议厅一共需要多少元？
<gadget id="calculator">45 * 900</gadget>
<output>40_500</output>

<gadget id="calculator">40_500 + 3_400</gadget>
<output>43_900</output>

<result>43_900</result>