The price of a certain product is 150 yuan before the price reduction, and the price is 120 yuan after the price reduction. How much is the reduction?
某产品降价前售价是150元，降价后售价是120元，降低了多少
<gadget id="calculator">150 - 120</gadget>
<output>30</output>

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

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