The factory expanded the factory building and spent 180,000 yuan, which is 25% less than the original plan. How much was the original plan? How much is listed correctly.
工厂扩建厂房，用了18万元，比原计划节约了25%，原计划用多少万元？正确列示是多少．
<gadget id="calculator">25 / 100</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">18 / (3/4)</gadget>
<output>24</output>

<result>24</result>