A school builds a new teaching building, and the actual investment is 2.1 million yuan, which is (1/8) less than the plan. How much is the planned investment?
某校新建一座教学楼，实际投资210万元，比计划节省了(1/8)，计划投资多少万元？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">210 / (7/8)</gadget>
<output>240</output>

<result>240</result>