The original price of a commodity is 400 yuan, and now it is sold at a 10% discount, what is the current price
一种商品原价400元，现按九折出售，现在的价格是多少元
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">400 * (9/10)</gadget>
<output>360</output>

<result>360</result>