Last year, Xiao Wang’s family’s income was 28,000 yuan. This year it has increased (1/7) compared to last year. How much more is this year’s income than last year?
去年小王家收入28000元，今年比去年增加了(1/7)，今年比去年多收入多少元？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">28_000 * (1/7)</gadget>
<output>4_000</output>

<result>4_000</result>