To process a farm tool, the original cost per piece was 80 yuan, but now it costs 64 yuan per piece. How much has the cost been reduced?
加工一种农具，原来每件成本80元，现在每件成本64元，成本降低了百分之几？
<gadget id="calculator">80 - 64</gadget>
<output>16</output>

<gadget id="calculator">16 / 80</gadget>
<output>1/5 = around 0.2</output>

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