One kind of upper bunk, the original price is 80 yuan, now the price is reduced by 20 yuan, how much is the reduction?
一种上铺，原价80元，现在降价20元，降低了百分之几？
<gadget id="calculator">20 / 80</gadget>
<output>1/4 = around 0.25</output>

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