Xiao Ming's family earned 4,000 yuan in April and 5,000 yuan in May. Compared with the two months, how much has the income increased
小明家4月份收入4000元，五月份收入5000元．两月相比，收入增加了多少
<gadget id="calculator">5_000 - 4_000</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 / 4_000</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>