The original price of a schoolbag is 120 yuan, and it is now on sale at a 10% discount. You can buy this schoolbag for as little as 120 yuan.
一个书包原价120元，现打九折出售，只要多少元就能买到这个书包．
<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>