clothing store is engaged in a sales promotion. What is the price of a jacket with an original price of 450 yuan after a 10% discount?
服装店搞促销活动，原价450元的上衣，打九折后的价格是多少元．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">450 * (9/10)</gadget>
<output>405</output>

<result>405</result>