After the summer harvest, farmers burn a large amount of straw in the wheat fields, causing large-scale air pollution. Now Huai'an District has introduced a new technology that uses straw to generate electricity and heat. If the total purchase price of 5 tons of straw is 700 yuan, how much income can be increased by the 12 tons of straw burned by farmer Uncle Wang's family.
夏收以后，农民在麦田里大量的焚烧秸杆，造成空气的大面积污染．现今淮安区引进了一种新技术，利用秸杆来发电供热．如果5吨秸杆的收购总价是700元，农民王大伯家焚烧掉的12吨秸杆可增加收入多少元．
<gadget id="calculator">700 / 5</gadget>
<output>140</output>

<gadget id="calculator">140 * 12</gadget>
<output>1_680</output>

<result>1_680</result>