The payment series can be broken down into two series:
Series 1: Payment of 100 for 25 years
Present value=Present value of ordinary annuity=payment/rate*(1-1/(1+rate)^n)=100/8%*(1-1/1.08^25)=1067.477619
Series 2: Arithmetic gradient of 20
Present value given as P is calculated using below formula
P=20/(8%*1.08^25)*((1.08^25-1)/0.08-25)=1756.082141
Total present value=Present value of first series+Present value of second series=1067.477619+1756.082141=2823.55976
Hence, loan amount=2823.55976
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