SOLUTION: The population of Houston increased from 1.2 million in 1970 to 1.6 million in 1980. What was the percentage increase?

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Question 277124: The population of Houston increased from 1.2 million in 1970 to 1.6 million in 1980. What was the percentage increase?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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The population of Houston increased from 1.2 million in 1970 to 1.6 million in 1980. What was the percentage increase?
:
%281.6-1.2%29%2F1.2 * 100 = 331%2F3% increase