Question
In Afghanistan, registered foreigners increased by 10% every 2 years. In 2008, 40% of the foreigners were unregistered. What was the total population of Afghanistan in 2008?
Answer: Option B
:
B
The number of registered foreigners in 2012 is 1.21 times (1.1)2 the number of registered foreiners in 2008 (as the their number increases 10% every 2 years)
So, registered foreigners in 2008 = (2.7121)×100= 2.23 million
Therefore total foreigners in 2008 = (2.2360)×100= 3.7 million
So, total population of Afghanistan in 2008 = (3.73)×100= 123 million.
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:
B
The number of registered foreigners in 2012 is 1.21 times (1.1)2 the number of registered foreiners in 2008 (as the their number increases 10% every 2 years)
So, registered foreigners in 2008 = (2.7121)×100= 2.23 million
Therefore total foreigners in 2008 = (2.2360)×100= 3.7 million
So, total population of Afghanistan in 2008 = (3.73)×100= 123 million.
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