Peace Supermarket "May 1st" promotion, all products are 10% off, Xiaohong bought a notebook 1.2 yuan cheaper than before, what is the original price of the notebook.
和平超市"五一"促销，所有的商品九折销售，小红买一本笔记本比原来便宜了1.2元，笔记本原价是多少元．
<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">1.2 / (1/10)</gadget>
<output>12</output>

<result>12</result>