The playground is 120 meters long and 80 meters wide. Now it is necessary to expand the playground area, the length remains the same, and the width is increased by 20 meters. What percentage will the enlarged playground area increase from the original?
操场长120米，宽80米．现在要扩大操场面积，长不变，宽增加20米．扩大后的操场面积将比原来增加百分之几？
<gadget id="calculator">80 + 20</gadget>
<output>100</output>

<gadget id="calculator">100 * 120</gadget>
<output>12_000</output>

<gadget id="calculator">120 * 80</gadget>
<output>9_600</output>

<gadget id="calculator">12_000 - 9_600</gadget>
<output>2_400</output>

<gadget id="calculator">2_400 / 9_600</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>