currently there are 1 lakh people living in a town name Jhumri Telaiya out of which one percent people are doctor this year new chemical factory was started in jhumritalaiyya and a number of engineer from other purpose migrated town to work in the factories after that the percentage of doctor in Jhumri tilaiya drop 2.8% how many engineer from other place migrated to Jhumri Telaiya if it is known that only engineer from other place migrated to the town and no other changes took place in the population of town
Answers
Given : 1 lakh people living in a town name Jhumri Telaiya out of which one percent people are doctor . a number of engineer migrated town to work in the factories after that the percentage of doctor in Jhumri tilaiya drop 0.8% (correction)
To find : how many engineer from other place migrated to Jhumri Telaiya
Solution:
People living in town Jhumri Telaiya = 100000
Doctors = 1 %
Number of Doctors = (1/100)100000 = 1000
Let say number of engineer migrated = E
Total population = 100000 + E
Doctors % = 100 * (1000)/(10000 + E )
100 * (1000)/(10000 + E ) = 0.8
=> 100000 = 80000 + 0.8E
=> 20000 = 0.8E
=> E = 25000
25000 Engineer migrated
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