Question

In: Economics

A large standby electricity generator in a hospital operating room has a first cost of $69,250...

A large standby electricity generator in a hospital operating room has a first cost of $69,250 and may be used for a maximum of 6 years. Its salvage value, which decreases by 15% per year, is described by the equation S = 69,250(1 − 0.15)n, where n is the number of years after purchase. The operating cost of the generator will be constant at $6,750 per year, and the interest rate is 12% per year. Determine the economic service life and associated AW values.

The economic service life is 6 years and the AW value is $−______ .

Solutions

Expert Solution

Using Excel for ESL analysis

Year Discount factor O&M cost PV (O&M) Cumulative (O&M) Cumulative (O&M) + Initial Cost Salvage value PV (Salvage value) NPV (A/P,15%,n) EUAC
A B C D=C*B E F=E+69250 G H=G*B I=F-H J K = I*J
1 0.86957 6750 5870 5870 75120 58863 51185 23935 1.150000 27525.00
2 0.75614 6750 5104 10974 80224 50033 37832 42391 0.615116 26075.58
3 0.65752 6750 4438 15412 84662 42528 27963 56699 0.437977 24832.78
4 0.57175 6750 3859 19271 88521 36149 20668 67853 0.350265 23766.50
5 0.49718 6750 3356 22627 91877 30727 15277 76600 0.298316 22851.12
6 0.43233 6750 2918 25545 94795 26118 11291 83504 0.264237 22064.81
Discount factor 1/(1+0.15)^n
(A/P,i,n) i((1 + i)^n)/((1 + i)^n-1)

As minimum EUAC is in 6th yr, therefore

ESL = 6 yrs

AW = -22064.81 ~ -22065

Showing formula in excel

Year Discount factor O&M cost PV (O&M) Cumulative (O&M) Cumulative (O&M) + Initial Cost Salvage value PV (Salvage value) NPV (A/P,15%,n) EUAC
A B C D=C*B E F=E+69250 G H=G*B I=F-H J K = I*J
1 =1/(1.15)^A3 6750 =C3*B3 =D3 =69250+E3 =69250*(1-0.15)^A3 =G3*B3 =F3-H3 =0.15*((1 + 0.15)^A3)/((1 + 0.15)^A3-1) =I3*J3
2 =1/(1.15)^A4 6750 =C4*B4 =E3+D4 =69250+E4 =69250*(1-0.15)^A4 =G4*B4 =F4-H4 =0.15*((1 + 0.15)^A4)/((1 + 0.15)^A4-1) =I4*J4
3 =1/(1.15)^A5 6750 =C5*B5 =E4+D5 =69250+E5 =69250*(1-0.15)^A5 =G5*B5 =F5-H5 =0.15*((1 + 0.15)^A5)/((1 + 0.15)^A5-1) =I5*J5
4 =1/(1.15)^A6 6750 =C6*B6 =E5+D6 =69250+E6 =69250*(1-0.15)^A6 =G6*B6 =F6-H6 =0.15*((1 + 0.15)^A6)/((1 + 0.15)^A6-1) =I6*J6
5 =1/(1.15)^A7 6750 =C7*B7 =E6+D7 =69250+E7 =69250*(1-0.15)^A7 =G7*B7 =F7-H7 =0.15*((1 + 0.15)^A7)/((1 + 0.15)^A7-1) =I7*J7
6 =1/(1.15)^A8 6750 =C8*B8 =E7+D8 =69250+E8 =69250*(1-0.15)^A8 =G8*B8 =F8-H8 =0.15*((1 + 0.15)^A8)/((1 + 0.15)^A8-1) =I8*J8
Discount factor 1/(1+0.15)^n
(A/P,i,n) i((1 + i)^n)/((1 + i)^n-1)

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