How to calculate the rapid interpolation method The cost of 1 million is 78 million, and the cost of 30 million is 78 million. How much is the cost of 2006 million?
If the cost of 2006 is x, then:
(x-0.78)/(2006-100)=(7.8-x)/(3000-2006)
x=5.39383448
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