The water fee paid by the school in April is 2,000 yuan, which is 20% less in April than in May. How much is the water fee paid in May?
学校四月份付水费是2000元，四月份比五月份节约两成，五月份付水费多少元．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2_000 / (4/5)</gadget>
<output>2_500</output>

<result>2_500</result>