A piece of clothing is 100 yuan cheaper after a 10% discount. How much is the original price of this piece?
一件衣服打九折后便宜了100元，这件的原价是多少钱？
<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">100 / (1/10)</gadget>
<output>1_000</output>

<result>1_000</result>