cost for machine tool are expected to be 1000$ at the end of the first year of the machines life and increase 100$/year thereafter. The machine tools expected like is 15 years. The firms MARR is 10%/year. What is the annual worth of the maintenance cost? Draw the cash flow diagram to help solve. HINT End of year one tools are expected to be 1000$, and then increases 100$ thereafter up to 15 years. Show ALL WORK and EQUATIONS, and explain work. This is a intrest formulas for continuous compounding and discrete cash flow type of problem.
ANSWER:
Cash flow diagram couldn't be uploaded due to technical reasons and so i am drawing the cash flow table.
year | cash flow ($100 increase from year 2 onwards ) |
1 | 1,000 |
2 | 1,100 |
3 | 1,200 |
4 | 1,300 |
5 | 1,400 |
6 | 1,500 |
7 | 1,600 |
8 | 1,700 |
9 | 1,800 |
10 | 1,900 |
11 | 2,000 |
12 | 2,100 |
13 | 2,200 |
14 | 2,300 |
15 | 2,400 |
i = 10% and n = 15
we will find the present worth and then the annual worth.
pw = cost in 1st year(p/a,i,n) + increase in cost per year(p/g,i,n)
pw = 1,000(p/a,10%,15) + 100(p/g,10%,15)
pw = 1,000 * 7.606 + 100 * 40.152
pw = 7,606 + 4,015.2
pw = 11,621.2
aw = pw(a/p,i,n)
aw = 11,621.2(a/p,10%,15)
aw = 11,621.2 * 0.1315
aw = 1,528.1878
so the annual worth of the maintenance cost is $1,528.1878
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