After making a batch of parts and improving the technology, the cost is reduced (1/4). Now it costs 1,800 yuan. How much did it cost to make this batch of parts?
做一批零件，改进技术后，成本降低(1/4)，现在需要1800元，做这批零件原来需要多少元？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1_800 / (3/4)</gadget>
<output>2_400</output>

<result>2_400</result>