Present value of annutiy =$20000
Yearly annuity (P)= 3500
Number of annnuity (n) = 8
Present value of annuity = P*(1-(1/(1+i)^20))/i
We will calculate i by trial and error method.
Assume is is 8%
Present value of annutiy = 3500*(1-(1/(1+8%)^8))/8%
20113.2363
Assume i is 8.5%
Present value of annuity = 3500*(1-(1/(1+8.5%)^8))/8.5%
19737.14039
Actual value 20000 is in between above values. So we will calcuate rate of return (i) by trial and error method.
interpolation formula = lower i +( uper i - lower i)*(lower i value - Actual i value)/(lower i value- uper i value)
8%+( (8.5%-8%)*(20113.2363-20000)/(20113.2363-19737.14039))
=0.08150541786 or 8.15%
So annuity interest rate is 8.15%
Note : financial calculator or excel function = rate(number of periods, annuity, -Present value)
=rate(8, 3500, - 20000)
=8.15%
So exact rate of return implied is 6.75%
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