The school playground was originally 120 meters long and 90 meters wide. After the expansion, the length and width increased by 30 meters each. Please do the math, how many meters has the playground area increased after the expansion?
学校操场原长120米、宽90米，扩建后，长和宽各增加了30米．请你算一算，扩建后的操场面积比原来增加了多少米？
<gadget id="calculator">120 + 30</gadget>
<output>150</output>

<gadget id="calculator">90 + 30</gadget>
<output>120</output>

<gadget id="calculator">150 * 120</gadget>
<output>18_000</output>

<gadget id="calculator">120 * 90</gadget>
<output>10_800</output>

<gadget id="calculator">18_000 - 10_800</gadget>
<output>7_200</output>

<result>7_200</result>