playground used to be 40 meters long and 35 meters wide. After expansion, the length increased by 15 meters and the width increased by 5 meters. How many square meters is the current grassland area larger than the original one?
一个操场原来长40米，宽35米，扩建后长增加15米，宽增加5米，现在的草场面积比原来多多少平方米？
<gadget id="calculator">40 + 15</gadget>
<output>55</output>

<gadget id="calculator">35 + 5</gadget>
<output>40</output>

<gadget id="calculator">55 * 40</gadget>
<output>2_200</output>

<gadget id="calculator">40 * 25</gadget>
<output>1_000</output>

<gadget id="calculator">2_200 - 1_000</gadget>
<output>1_200</output>

<result>1_200</result>