After a semiconductor component factory implements production automation, the production cost of a component is reduced by 20% compared with the original one. Now the cost per piece is 30 yuan. How much was the original cost per piece?
一个半导体元件厂实行生产自动化后，一种元件的生产成本比原来降低了20%，现在每件成本是30元，原来每件成本是多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">30 / (4/5)</gadget>
<output>75/2 = around 37.5</output>

<result>75/2 = around 37.5</result>