Equivalence When PP>=CP
Equipment maintenance costs for manufacturing explosion-proof pressure switches are projected to be $125,000 in year one and increase by 2.5% each year through year five. What is the equivalent annual worth of the maintenance costs at an interest rate of 10% per year, compounded monthly?
The equivalent annual worth is $
Effective annual interest rate = (1+r/n)^n-1
=(1+0.01/12)^12-1
=0.104713 = 10.47%
Finding present value of maintenance cost
year | O&M Cost | PV Factor | Present Value |
1 | -125,000.00 | 0.954991 | -119373.91 |
2 | -128,125.00 | 0.912008 | -116851.06 |
3 | -131,328.13 | 0.87096 | -114381.54 |
4 | -134,611.33 | 0.831759 | -111964.20 |
5 | -137,976.61 | 0.794323 | -109597.96 |
-572168.68 |
Annual worth = present worth * ( A/P, 10.4713%, 5yrs)
=-572168.68*0.266981
=-152758.2
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