From 1980-1990, the population of a country increased by 20%. From 1990-2000, the population of the country increased by 20%. From 2000-2010, the population of the country increased by 20%. Then the overall increased population (in percentage) of the country from 1980-2010 was
Options:
A . 60 %
B . 72.2 %
C . 72.8 %
D . 62.8 %
Answer: Option C Answer: (c) Using Rule 7, If a number is first increased by a% and then again increased by b%, then total increase percent is $(a + b + {ab}/100)%$
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