In: Accounting
Annual Depreciation (straight line method) = (12000 - 2000)/5 = $2000
Annual Operating cash flow = Benefits + Annual depreciation = 1000+2000 = $3000
1. Payback Period = Net Investment / Annual cash inflow
= (12000 - 2000) /3000 = 10000 / 3000 = 3.33 years
2. Annual rate of return = Average Accounting profit / Average Investment
= 1000/12000 = 8.34%
3.
| 
 Investment =  | 
 12000  | 
||||
| 
 Year  | 
 1  | 
 2  | 
 3  | 
 4  | 
 5  | 
| 
 Cash inflows  | 
 3000  | 
 3000  | 
 3000  | 
 3000  | 
 3000  | 
| 
 Salvage Value  | 
 2000  | 
P.V. of cash inflow = 3000*(1-1/ (1+R)^5) / R + 2000/(1+R)^5
At 12% Discount rate:
Present value of cash inflows = $11949.18
At 11% Discount rate:
Present value of cash inflows = $12274.59
So, as per the method of interpolation:
IRR = 11% + (12% - 11%)*(P.V. at 11% - 12000) / (P.V. at 11% - P.V. at 12%)
IRR = 11% + 1% * (12274.59 - 12000) / (12274.59 - 11949.18) = 11.84% or 12% approx
4. Cost of capital = 6%
NPV = Present value of cash inflows - Present value of investments
= 3000*(1-1/1.06^5)/.06 + 2000/1.06^5 - 12000 =14131.61 - 12000
= $2131.61 = $ 2132 approx
5.
Profitability index = Present value of cash inflows/ Present value of investments
= 14131.61 / 12000 = 1.18 approx