A rectangular stadium has a perimeter of 300 meters and a width of 50 meters. How many square meters does the stadium occupy?
一个长方形体育场周长是300米，宽是50米，体育场占地多少平方米？
<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">300 - 100</gadget>
<output>200</output>

<gadget id="calculator">200 / 2</gadget>
<output>100</output>

<gadget id="calculator">100 * 50</gadget>
<output>5_000</output>

<result>5_000</result>