Tianyu Real Estate Company has completed a project with an actual investment of 34 million yuan, which is 3/20 less than planned. How much is the planned investment?
天宇房地产公司完成一项工程，实际投资3400万元，比计划节约(3/20)，计划投资多少万元？
<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">3_400 / (17/20)</gadget>
<output>4_000</output>

<result>4_000</result>