the minimum number of half years in which a sum of money kept 60% compund interest will be quadrupled is

• Assume the initial amount will be 1000
  quadrple means the amount will be 4 times higher than the initial amount so 4000
  shortcut method for C.I
  for 1st year=1000*60/100=600
  for 2nd year=(1000+600)*60/100=960
  for 3rd year=(100+600+960)*60/100=1536
  for calculating th 4th year the amount will be(1000+600+960+1536)=4096..so gthe amount will be quardupled in the fourth year...
  in 1year we have 2 half years..so 1st 3 year=6 half year..we calculate for 4th year the amount will be touch the 4000 in the first half year....so (6+1)=7 half year will be needed.
  
• 9 years agoHelpfull: Yes(8) No(1)
• at the end of first year amt will be 1690
  at the end of second year amt will be 2856
  at end of tird year amt will be 3398
  now 6 half years passed
  at seventh half year amt will be quadrapled
  ans is 7
• 9 years agoHelpfull: Yes(0) No(4)
• but the CI formula is p(1+r/100)^n...by this if we solve we get only 2 years ie:4 half years
• 9 years agoHelpfull: Yes(0) No(1)