The present population of town is 16000.if it increases at rate of 5%p.a.,What will be the unit digit of population after 2 years
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☆ Given:-
- Present population of town = 16000
- Rate of increase of population = 5%p.a.
- Time = 2 years
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☆ To Find:-
- Population of town after 2 years
- Unit digit of population after 2 years
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☆ Solution:-
➢ Population of town after 1 year
= Present population + 5% of population
= 16000 + 5% of 16000
= 16000 + ((5/100) × 16000)
= 16000 + (16000 ÷ 20 )
= 16000 + 800
= 16800
➢ Population of town after 2 year
= Population after 1 year + 5% of population
= 16800 + 5% of 16800
= 16800 + ((5/100) × 16800)
= 16800 + (16800 ÷ 20)
= 16800 + 840
= 17640
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☆ Answer:-
Population of town after 2 years is 17640.
∴ Unit digit of population after 2 year is 0.
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