ardz24 wrote:At the beginning of 2010, 60% of the population of Town X lived in the south and the rest lived in the north. During 2010, the population of Town X grew by 5.5%. If the population in the south grew by 4.5%, by how much did the population in the north grow?
A. 1%
B. 3.5%
C. 6.5%
D. 7%
E. 13.75%
Alternate approach:
Let the population in the south = 600 and the population in the north = 400, for a total of 1000 people.
Total growth for entire population of 1000 people = 5.5% of 1000 = 55.
Growth for the 600 people in the south = 4.5% of 600 = 27.
Growth for the 400 people in the north = (total growth) - (growth in the south) = 55-27 = 28.
Percentage growth in the north = (growth in the north)/(total in the north) * 100 = (28/400) * 100 = 7.
The correct answer is
D.
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