Andy C. answered 10/01/17
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3.5% = 0.035
So to find the increase of 3.5%, you multiply by 100% + 3.5% = 1.00000 + 0.035 = 1.035
Let X be the 2001 population.
Then 1.035* X = 33.2 million
X = 33.2 million / 1.035 = 32,077,295