The cost of producing a watch is reduced from 45 yuan to 20 yuan. How much is the cost reduced?
生产一种手表成本由原来45元降低到20元，成本降低百分之几？
<gadget id="calculator">25 / 40</gadget>
<output>5/8 = around 0.625</output>

<result>5/8 = around 0.625</result>