All products in the mall are 30% off, and the current price of a piece of clothing is 210 yuan. How much is the original price?
商场所有商品一律七折，一件衣服现价210元，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>