A commodity is priced at 42 yuan after a price reduction of 8 yuan. How much has the price of this commodity been reduced?
一种商品，降价8元后售价42元，这种商品的价格降低了多少．
<gadget id="calculator">42 + 8</gadget>
<output>50</output>

<gadget id="calculator">8 / 50</gadget>
<output>4/25 = around 0.16</output>

<result>4/25 = around 0.16</result>