
i.
Interest Rates preferred for each payment plan.

Answer to Problem 24P
Interest rate | Best Choice |
0% | Alternative D |
17.84% | Alternative A |
Explanation of Solution
Given:
Availability of Magazine for $58 for 1 year
Availability of Magazine for $108 for 2 year
Availability of Magazine for $153 for 3 year
Availability of Magazine for $230 for 5 year.
Calculation:
There are four alternatives available for payment.
Year | A | B | C | D | D-A |
1 | -58 | -108 | -153 | 0 | 58 |
2 | -58 | 0 | 0 | 0 | 58 |
3 | -58 | -108 | 0 | -230 | -172 |
4 | -58 | 0 | -153 | 0 | 58 |
5 | -58 | -108 | 0 | 0 | 58 |
6 | -58 | 0 | 0 | -230 | -172 |
7 | -58 | -108 | -153 | 0 | 58 |
8 | -58 | 0 | 0 | 0 | 58 |
9 | -58 | -108 | 0 | -230 | -172 |
10 | -58 | 0 | -153 | 0 | 58 |
11 | -58 | -108 | 0 | 0 | 58 |
12 | -58 | 0 | 0 | -230 | -172 |
13 | -58 | -108 | -153 | 0 | 58 |
14 | -58 | 0 | 0 | 0 | 58 |
15 | -58 | -108 | 0 | -230 | -172 |
16 | -58 | 0 | -153 | 0 | 58 |
17 | -58 | -108 | 0 | 0 | 58 |
18 | -58 | 0 | 0 | -230 | -172 |
19 | -58 | -108 | -153 | 0 | 58 |
20 | -58 | 0 | 0 | 0 | 58 |
21 | -58 | -108 | 0 | -230 | -172 |
22 | -58 | 0 | -153 | 0 | 58 |
23 | -58 | -108 | 0 | 0 | 58 |
24 | -58 | 0 | 0 | -230 | -172 |
25 | -58 | -108 | -153 | 0 | 58 |
26 | -58 | 0 | 0 | 0 | 58 |
27 | -58 | -108 | 0 | -230 | -172 |
28 | -58 | 0 | -153 | 0 | 58 |
29 | -58 | -108 | 0 | 0 | 58 |
30 | -58 | 0 | 0 | -230 | -172 |
The number of periods extended to 30 years because of different useful life. One alternative is available for 5 years and other is for 3 years and another one is available for 2 years. So, the least common factor is 1,2,3 and 5 is 30. This table represents the cash flow of all the four alternatives. Negative value means
Graph of net present worth of all four alternatives versus interest rate.
Graph:
The graph clears the picture and explains that the alternative C and D are not part of the answer. Only alternative A and D is important.
Net Present worth of (Alternative B)-(Alternative A):
P = initial Cost
A = annual payment that is uniform all the period
F1 =
F2 = future Value in 11th year
F3 = Future Value in 16th year
F4 = future value in 21st year
F5 = Future Value in 26th year
I =
N = time period
P | A | F1 | F2 | F3 | F4 | F5 | i | n |
$172 | $58 | $230 | $230 | $230 | $230 | $230 | ? | $30 |
Time period
6 for F1
11 for F2
16 for F3
21 for F4
26 for F5
Interest rate | (P/A,i,30) | (P/ F1,i,6) | (P/ F2,i,11) | (P/ F3,i,16) | (P/ F4,i,21) | (P/ F5,i,26) |
15.00% | 6.566 | 0.4343 | 0.2149 | 0.1069 | 0.0531 | 0.0264 |
18.00% | 5.571 | 0.3704 | 0.1619 | 0.0708 | 0.0309 | 0.0135 |
The rate of return, which is between 15% and 18% is computed by linear interpolation:
Therefore, the incremental rate of return is 17.84%.
Conclusion:
Choice Table:
Interest rate | Best Choice |
0% | Alternative D |
17.84% | Alternative A |
ii.
Impact on environment due to glossy paper of magazine.

Answer to Problem 24P
- Lead to highest destruction of forest which had been sustainably managed. As magazine requires higher-grade paper.
- Glossy paper of magazine results in contamination of recycling process of paper.
- Ultraviolet sealing coating on glossy paper complicated recycling of paper.
- Glossy papers are made with toxic chlorine, which leads to soil pollution.
Explanation of Solution
Given:
Subscription of Magazine with different plans.
Concept used:
Conclusion:
Want to see more full solutions like this?
Chapter 8 Solutions
Engineering Economic Analysis
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