The original price of a coat is 100 yuan, but now the price is reduced by 20 yuan. How much is the reduction?
一件上衣，原价100元，现在降价20元，降低了百分之几？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

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