Population of a town increases 2.5%annuallybut is decreasedby0.5%everyyear due to migration. What will be the percentage of increase in 2 years?
Net % increase in population = (2.5 - 0.5) = 2%
Let original population = 100
Population of town after 2 yrs = $$ 100 \times \frac{102}{100} \times \frac{102}{100} $$
                       = 104.04
Now % increase in population = $$ \frac{4.04}{100} \times 100 $$
                       = 4.04%
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