A product from a certain factory used to cost 96 yuan per piece, but after technological innovation, the cost per piece has been reduced to 84 yuan. How much has the cost per piece been reduced?
某厂的一种产品，原来每件成本96元，技术革新后，每件成本降低到了84元，每件成本降低了百分之几？
<gadget id="calculator">96 - 84</gadget>
<output>12</output>

<gadget id="calculator">12 / 96</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>