If you buy a new building of 105 square meters and lay floor tiles during decoration, the floor tiles cost 42 yuan per square meter. How much does it cost to buy floor tiles when decorating this building?
新购一套105平方米的楼房，装修时铺地砖，每平方米地砖42元，装修这套楼房时购买地砖需多少元？
<gadget id="calculator">42 * 105</gadget>
<output>4_410</output>

<result>4_410</result>