For a restaurant, the length of the restaurant is about 40 steps and the width is 30 steps. It is known that the length of one step is about 50 centimeters, so how many square meters is the restaurant?
一个餐厅，用步测的方法测得餐厅长约40步，宽30步，已知一步长约50厘米，那么这个餐厅约有多少平方米．
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">40 * (1/2) * 30 * (1/2)</gadget>
<output>300</output>

<result>300</result>