Answer: Option A
:
A
In 2012, total registered foreigners = 2.7 million.
Therefore total population = $\left(\frac{2.7}{4}\right)\times 100$= 67.5 million
So, total population in 2000 = $\frac{67.5}{1.55}$= 43.5 million
Total registered foreigners in 2000 = $\frac{2.7}{7.7}$= 0.35 million
In 2012, total registered foreigners = 4% and total foreigners = 6%
Total unregistered foreigners = 2%
Total unregistered population in 2012 = 67.5$\times$0.02 = 1.35 million.
Total unregistered population in 2000 = 43.5$\times$0.01-0.35 = 1.35 million.
Hence the required increase = 1.35 - 0.085 = 1.265 million.