There is a kind of product that is 10% off first, and then increased by 20%, and it is sold for 108 yuan. How much is the original price?
有一种商品，先九折，再提高20%，结果以108元卖出，原价多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">108 / (6/5) / (9/10)</gadget>
<output>100</output>

<result>100</result>