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    				| 1. | The population of a village is 20000. If the rate of birth be 4% per annum and the of death be 2% per annum, then find the population of the village after 2 years. | 
| Answer» Rate of birth `=4%` per annum. Rate of death `=2%` per annum. `:.` Rate of growth of population `=(4%-2%)` per annum `=2%` per annum The present population of the village is 20000. `:.` The population of the village after 2 years will be `20000xx(1+2/100)^(2)=20000xx(1+1/50)^(2)` `=20000xx(51/50)^(2)=20000xx(51xx51)/(50xx50)` `=20808`. Hence the required population of the village after 2 years will be 20808. | |