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?
Options:
A .
180.4 million
B .
123 million
C .
96 million
D .
82 million
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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