During the "May 1st" event, the price of Haier brand air conditioners was 2,000 yuan, which was a discount of 500 yuan from the original price. How much was the discount?
"五一"活动期间海尔牌空调售价2000元，比原价优惠了500元，优惠了百分之几？
<gadget id="calculator">2_000 + 500</gadget>
<output>2_500</output>

<gadget id="calculator">500 / 2_500</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>