The cost of producing a textile machine at the County Textile Machinery Factory is only 84% of the original cost. How much is the cost reduced now?
县纺机厂现在生产一台纺织机的成本只有原来的84%，现在比原来降低成本多少．
<gadget id="calculator">84 / 100</gadget>
<output>21/25 = around 0.84</output>

<gadget id="calculator">1 - (21/25)</gadget>
<output>4/25 = around 0.16</output>

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