In: Economics
The operation cost of a company is $500,000 this year (year 0). The company expects an annual cost of $100,000 from year 1 to year 5, and the cost decreases by 4% each year from year 6 to year 12. What's the equivalent annual worth if all the expenses occur within years 1-12 ( I=10%)
operation cost in yr 0 is 500000
annual cost of 100000 from year 1 to year 5, and the cost decreases by 4% each year from year 6 to year 12.
i = 10%
t = 12yrs
We need to find the present cost and then using the annuity factor of (A/P,10%,12) convert that present value into annual series
using excel
| Year | Maintenance Cost | PV Factor | Present value | 
| 0 | 5,00,000.00 | 1 | 5,00,000.00 | 
| 1 | 1,00,000.00 | 0.909090909 | 90,909.09 | 
| 2 | 1,00,000.00 | 0.826446281 | 82,644.63 | 
| 3 | 1,00,000.00 | 0.751314801 | 75,131.48 | 
| 4 | 1,00,000.00 | 0.683013455 | 68,301.35 | 
| 5 | 1,00,000.00 | 0.620921323 | 62,092.13 | 
| 6 | 96,000.00 | 0.56447393 | 54,189.50 | 
| 7 | 92,160.00 | 0.513158118 | 47,292.65 | 
| 8 | 88,473.60 | 0.46650738 | 41,273.59 | 
| 9 | 84,934.66 | 0.424097618 | 36,020.59 | 
| 10 | 81,537.27 | 0.385543289 | 31,436.15 | 
| 11 | 78,275.78 | 0.350493899 | 27,435.18 | 
| 12 | 75,144.75 | 0.318630818 | 23,943.43 | 
| Total present value | 11,40,669.76 | ||
Equivalent annual cost = present value * (A/P,10%,12)
= 11,40,669.76 * (A/P,10%,12)
= 11,40,669.76 * 0.146763315
= 167408.47
Showing formula in excel
| Year | Maintenance Cost | PV Factor | Present value | 
| 0 | 500000 | =1/(1+0.1)^W3 | =X3*Y3 | 
| 1 | 100000 | =1/(1+0.1)^W4 | =X4*Y4 | 
| 2 | 100000 | =1/(1+0.1)^W5 | =X5*Y5 | 
| 3 | 100000 | =1/(1+0.1)^W6 | =X6*Y6 | 
| 4 | 100000 | =1/(1+0.1)^W7 | =X7*Y7 | 
| 5 | 100000 | =1/(1+0.1)^W8 | =X8*Y8 | 
| 6 | =X8*(1-0.04) | =1/(1+0.1)^W9 | =X9*Y9 | 
| 7 | =X9*(1-0.04) | =1/(1+0.1)^W10 | =X10*Y10 | 
| 8 | =X10*(1-0.04) | =1/(1+0.1)^W11 | =X11*Y11 | 
| 9 | =X11*(1-0.04) | =1/(1+0.1)^W12 | =X12*Y12 | 
| 10 | =X12*(1-0.04) | =1/(1+0.1)^W13 | =X13*Y13 | 
| 11 | =X13*(1-0.04) | =1/(1+0.1)^W14 | =X14*Y14 | 
| 12 | =X14*(1-0.04) | =1/(1+0.1)^W15 | =X15*Y15 | 
| Total present value | =SUM(Z3:Z15) | ||