A piece of clothing is sold at a 10% discount, which is 30 yuan cheaper than the original price. How much is the original price of this piece of clothing?
一件衣服九折出售，比原价便宜30元，这件衣服原价多少元？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">30 / (1/10)</gadget>
<output>300</output>

<result>300</result>