The original price of a storybook is 120 yuan, and now each book is sold at a discount of 10% off the original price. How much is the current price?
一本故事书原价120元，现在每本按原价打九折出售，现价多少元？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">120 * (9/10)</gadget>
<output>108</output>

<result>108</result>