A commodity is now 120 yuan per piece, which is 30 yuan lower than the original price. How much is the price reduction?
一种商品现在每件120元，比原来降低了30元，降价百分之几？
<gadget id="calculator">120 + 30</gadget>
<output>150</output>

<gadget id="calculator">30 / 150</gadget>
<output>1/5 = around 0.2</output>

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