Wang Hua’s bedroom is paved with square bricks with a side length of 30 cm. There are 200 tiles in total. What is the area of Wang Hua’s bedroom in square meters?
王华家卧室铺边长为30厘米的方砖铺地，共铺了200块，王华家的卧室面积是多少平方米．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) * (3/10) * 200</gadget>
<output>18</output>

<result>18</result>