A product is sold at a 10% discount, and the price has been reduced ((())/(())). If the original price is 200 yuan, how much is it after the price reduction?
一件商品九折出售，降价了((())/(()))，如果原价为200元，降价后是多少元．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">200 * (9/10)</gadget>
<output>180</output>

<result>180</result>