In: Economics
A company has invested $10 million to construct a food irradiation plant with technology to destroy organisms that cause spoilage and disease, thus extending the shelf life of the fresh produce and distances over which they can be shipped. The expected operating and maintenance costs (after taxes) would be $4 million at year 1 and increase by 2% each year. The plant is expected to have a useful life of 20 years. If the company's annual benefits (after taxes) are estimated to be $6 million after year 1 and increase by $100,000 each year, find the discounted payback period. The company's interest rate is 12%. (Provide excel spreadsheets for all problems)
Payback Period (Round to an integer):_______
Sketch of cash flow diagram:
Annual net benefit (NAB) = Annual benefit - Annual O&M costs
In year 0, NAB = - $10 million
Year | Benefit ($) | Cost ($) | NAB ($) | PV Factor @12% | Discounted NAB ($) | Cumulative discounted NAB ($) |
0 | -100,00,000 | -100,00,000 | 1.0000 | -100,00,000 | -100,00,000 | |
1 | 60,00,000 | 40,00,000 | 20,00,000 | 0.8929 | 17,85,714 | -82,14,286 |
2 | 61,00,000 | 40,80,000 | 20,20,000 | 0.7972 | 16,10,332 | -66,03,954 |
3 | 62,00,000 | 41,61,600 | 20,38,400 | 0.7118 | 14,50,893 | -51,53,061 |
4 | 63,00,000 | 42,44,832 | 20,55,168 | 0.6355 | 13,06,096 | -38,46,965 |
5 | 64,00,000 | 43,29,729 | 20,70,271 | 0.5674 | 11,74,728 | -26,72,237 |
6 | 65,00,000 | 44,16,323 | 20,83,677 | 0.5066 | 10,55,656 | -16,16,582 |
7 | 66,00,000 | 45,04,650 | 20,95,350 | 0.4523 | 9,47,830 | -6,68,752 |
8 | 67,00,000 | 45,94,743 | 21,05,257 | 0.4039 | 8,50,278 | 1,81,526 |
9 | 68,00,000 | 46,86,638 | 21,13,362 | 0.3606 | 7,62,100 | 9,43,626 |
10 | 69,00,000 | 47,80,370 | 21,19,630 | 0.3220 | 6,82,464 | 16,26,090 |
11 | 70,00,000 | 48,75,978 | 21,24,022 | 0.2875 | 6,10,606 | 22,36,696 |
12 | 71,00,000 | 49,73,497 | 21,26,503 | 0.2567 | 5,45,820 | 27,82,516 |
13 | 72,00,000 | 50,72,967 | 21,27,033 | 0.2292 | 4,87,461 | 32,69,977 |
14 | 73,00,000 | 51,74,427 | 21,25,573 | 0.2046 | 4,34,934 | 37,04,912 |
15 | 74,00,000 | 52,77,915 | 21,22,085 | 0.1827 | 3,87,697 | 40,92,609 |
16 | 75,00,000 | 53,83,473 | 21,16,527 | 0.1631 | 3,45,251 | 44,37,860 |
17 | 76,00,000 | 54,91,143 | 21,08,857 | 0.1456 | 3,07,143 | 47,45,003 |
18 | 77,00,000 | 56,00,966 | 20,99,034 | 0.1300 | 2,72,958 | 50,17,961 |
19 | 78,00,000 | 57,12,985 | 20,87,015 | 0.1161 | 2,42,317 | 52,60,277 |
20 | 79,00,000 | 58,27,245 | 20,72,755 | 0.1037 | 2,14,876 | 54,75,153 |
Discounted payback period (DPBP) is the time by when cumulative discounted NAB is zero.
DPBP lies between years 7 and 8. Therefore
DPBP = 7 + (Absolute value of cumulative discounted NAB in year 7 / Discounted NAB in year 8)
= 7 + (668,752/ 850,278) = 7 + 0.79 = 7.79 years
DPBP = 8 years
Cash flow diagram as follows (Values in $Million).