Xiao Wang's income last month was 2,500 yuan, and this month's income is 2,800 yuan. How much has this month's income increased compared with last month's?
小王家上月的收入是2500元，本月的收入是2800元，本月比上月收入增长了多少．
<gadget id="calculator">2_800 - 2_500</gadget>
<output>300</output>

<gadget id="calculator">300 / 2_500</gadget>
<output>3/25 = around 0.12</output>

<result>3/25 = around 0.12</result>