A man deposit certain amount as fixed deposit at the rate of r% compounded annually.
If he accrued rs 17280 and 20736 as intrest in 4 and 5 year respectively,then how much he total accrued in 1st 3 years??

• Rs 14400 ,
  (*If the sum total accrued is 17280 & 20736 after 4 & 5 yrs. and not the interest)
  If Amount=x, Interest rate=r
  Sum total accrued after 4 years= x[1+(r/100)]^4=17280 ---(i)
  Sum total accrued after 5 years= x[1+(r/100)]^5=20736 ---(ii)
  From (i) & (ii), 17280[1+(r/100)]=20736, solving r=20
  From (i) ,x=17280*625/1296
  So Sum total accrued after 3 years= [17280*625/1296][1+(20/100)]^3=14400
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• 14400 solution
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