A product is 500 yuan, and it will be sold at 450 yuan after the promotional price reduction. How much cheaper after the price cut.
一件商品500元，促销降价后卖450元．降价后便宜了多少．
<gadget id="calculator">500 - 450</gadget>
<output>50</output>

<gadget id="calculator">50 / 500</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>