The population of a city increases by 4% per year but due to migration it decrease by 1% per years. What will be the percentage increase in population in 3 years?
(a) 9%
(b) 9.27%
(c) 27%
(d) 12%
(e) None of these

• (b); Actual increase in population=3%
  Let, earlier population=100 then the population after 3 years
  =100(1+3/100)^3=109.2727
  ∴Required percentage=9.27%
• 7 years agoHelpfull: Yes(22) No(2)
• 9.27%
  compound rate of increase
  
• 7 years agoHelpfull: Yes(2) No(1)
• this is compound rate of increase,
  actual increase = 4-1=3%
  100(1+3/100)^3=109.2727
  Required percentage=9.27%
• 7 years agoHelpfull: Yes(2) No(0)
• use compound intrest concept
• 6 years agoHelpfull: Yes(1) No(2)