The pig farm raised 280 pigs last year, and this year it has increased by 40% compared to last year. How many pigs will be raised this year?
养猪场去年养猪280头，今年比去年增加40%，今年养猪多少头？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">280 * (7/5)</gadget>
<output>392</output>

<result>392</result>