Question

The population of a village is 8125.if the annual birth rate is 7% and death rate is 3% calculate the population after 2 years?

Answer 1

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Net birth rate = Annual birth rate - annual death rate = 7 -3 = 4%

This problem is similar to compound intrest calculated annually

There , amount A for a principal P after n years = where , r is rate of intrest in percentagesimilar to it ,

Net birth rate can be taken as Rate of intrest

Present population as Principal

Net birth rate in percentage = 0.04So , population after 2 years=8125 * ( 1 + 0.04 )^2 = 8788.