A children's clothing store sells all clothes at a 10% discount. Dongdong's mother bought a jacket for Dongdong, which was 12 yuan cheaper than the original price. How much was the original price of the jacket?
一家童装店的衣服全部打九折出售，冬冬的妈妈给冬冬买一件上衣，比原价便宜了12元，这件上衣原价多少元？
<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">12 / (1/10)</gadget>
<output>120</output>

<result>120</result>