Population of town A increases by 1000 each year
So population of town A in n yrs = 10000 + 1000*n
Population of town B increases by 5% each year
So population of town B in n yrs = 10000(1+5/100)n = 10000(1.05)n
We need to find n, for
10000 + 1000*n = 10000(1.05)n
1+0.1n = 1.05n
Substitute for each of the options in the equation above
For n = 31
1+0.1n = 1 + 0.1*31 = 4.1
1.05n = 1.05^31 = 4.5
Since exponential fnctionhas exceedd the linear function we need a lesser value of n
So put n = 27
1+0.1n = 1 + 0.1*27 = 3.7
1.05n = 1.05^27 = 3.7
27 years is the answer
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