The school pays 1,500 yuan for water in May, which is 500 yuan less than that in April. How much is the savings?
学校五月份付水费是1500元，比四月份节约500元，节约了百分之几？
<gadget id="calculator">1_500 + 500</gadget>
<output>2_000</output>

<gadget id="calculator">500 / 2_000</gadget>
<output>1/4 = around 0.25</output>

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