The original price of a piece of clothing is 600 yuan, but now it is 420 yuan. How much is the price reduction from the original price?
一件衣服原来售价是600元，现在售价是420元，比原来降价了百分之几？
<gadget id="calculator">600 - 420</gadget>
<output>180</output>

<gadget id="calculator">180 / 600</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>