The original price of a piece of clothing is 50 yuan, but now it is sold at a 10% discount. How much is the price of each piece?
一种衣服原价每件50元，现在打九折出售，每件售价多少元？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">50 * (9/10)</gadget>
<output>45</output>

<result>45</result>