A piece of clothing is 210 yuan after a 30% discount. How much is the original price of this piece of clothing?
一件衣服打七折后是210元，这件衣服原价多少元．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">210 / (7/10)</gadget>
<output>300</output>

<result>300</result>