A commodity is now priced at 40 yuan, which is 10 yuan lower than the original price. How much is the price reduction from the original price?
一种商品，现在售价40元，比原价降低了10元，比原价降价了百分之几？
<gadget id="calculator">40 + 10</gadget>
<output>50</output>

<gadget id="calculator">10 / 50</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>