The school built a comprehensive building with an actual investment of 1.7 million yuan, which is 15% less than the plan. How much is the planned investment?
学校建综合楼，实际投资170万元，比计划节约了15%，计划投资多少万元？
<gadget id="calculator">15 / 100</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">170 / (17/20)</gadget>
<output>200</output>

<result>200</result>