The original cost of a machine part is 4.5 yuan. After improving the technology, it is reduced by (3/20). How much is the current cost per piece?
一种机器零件原来成本4.5元，改进技术后，降低了(3/20)，现在的成本是每件多少元？
<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">4.5 * (17/20)</gadget>
<output>3.825</output>

<result>3.825</result>