The school built a computer room with an actual investment of 200,000 yuan, which is 20% less than planned. How much is the planned investment? (column equation solution)
学校建电脑房，实际投资20万元，比计划节约了20%，计划投资多少万元？(列方程解答)
<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">20 / (4/5)</gadget>
<output>25</output>

<result>25</result>