A professional pig farmer raised 28 pigs last year and 40 pigs this year, with an average income of 250 yuan per pig. How much more is the income this year than last year?
一个养猪专业户，去年养猪28头，今年养猪40头，平均每头猪收入250元，今年比去年多收入多少元？
<gadget id="calculator">40 - 28</gadget>
<output>12</output>

<gadget id="calculator">12 * 250</gadget>
<output>3_000</output>

<result>3_000</result>