A certain brand of clothing has a price reduction promotion. After a 30% discount, the price is 420 yuan. What is the original price of this kind of clothing?
某品牌服装降价促销，打7折后，售价是420元，这种服装原价多少元．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">420 / (7/10)</gadget>
<output>600</output>

<result>600</result>