In: Economics
Annual costs of 3 different systems are provided below. If the MARR is 8%, which system is the least costly of the three? Use incremental investment analysis and show all steps.
| 
 Year  | 
 System A  | 
 System B  | 
 System C  | 
| 
 0  | 
 $0  | 
 $2,000,000  | 
 $4,000,000  | 
| 
 1  | 
 $9,000,000  | 
 $3,800,000  | 
 $1,900,000  | 
| 
 2  | 
 $9,000,000  | 
 $3,800,000  | 
 $1,900,000  | 
| 
 3  | 
 $9,000,000  | 
 $3,800,000  | 
 $1,900,000  | 
| 
 4  | 
 $9,000,000  | 
 $3,800,000  | 
 $1,900,000  | 
| 
 5  | 
 $9,000,000  | 
 $3,800,000  | 
 $1,900,000  | 
| 
 6  | 
 $9,000,000  | 
 $3,800,000  | 
 $1,900,000  | 
| 
 7  | 
 $9,000,000  | 
 $3,800,000  | 
 $1,900,000  | 
| 
 8  | 
 $9,000,000  | 
 $3,800,000  | 
 $1,900,000  | 
If you use Excel to solve these problems, please provide details of the functions that you used.
MARR = 8%
We need to perform incremental IRR analysis
Using Excel
| System Costs | Incremental IRR Analysis | ||||
| Year | A | B | C | B-A | C-B | 
| 0 | 0 | -2000000 | -4000000 | -2000000 | -2000000 | 
| 1 | -9000000 | -3800000 | -1900000 | 5200000 | 1900000 | 
| 2 | -9000000 | -3800000 | -1900000 | 5200000 | 1900000 | 
| 3 | -9000000 | -3800000 | -1900000 | 5200000 | 1900000 | 
| 4 | -9000000 | -3800000 | -1900000 | 5200000 | 1900000 | 
| 5 | -9000000 | -3800000 | -1900000 | 5200000 | 1900000 | 
| 6 | -9000000 | -3800000 | -1900000 | 5200000 | 1900000 | 
| 7 | -9000000 | -3800000 | -1900000 | 5200000 | 1900000 | 
| 8 | -9000000 | -3800000 | -1900000 | 5200000 | 1900000 | 
| Incremental IRR | 259.99% | 94.54% | |||
We compare first A and B since A has the lowest cost, and the second lowest option is B, incremental IRR > MARR so we select B, and reject A
Now we find incremental cash flow between C & B, we find incremental IRR>MARR, so we select C and reject B
Option C should be selected as per Incremental IRR analysis
Showing formula in excel
| System Costs | Incremental IRR Analysis | ||||
| Year | A | B | C | B-A | C-B | 
| 0 | 0 | -2000000 | -4000000 | =O30-N30 | =P30-O30 | 
| 1 | -9000000 | -3800000 | -1900000 | =O31-N31 | =P31-O31 | 
| 2 | -9000000 | -3800000 | -1900000 | =O32-N32 | =P32-O32 | 
| 3 | -9000000 | -3800000 | -1900000 | =O33-N33 | =P33-O33 | 
| 4 | -9000000 | -3800000 | -1900000 | =O34-N34 | =P34-O34 | 
| 5 | -9000000 | -3800000 | -1900000 | =O35-N35 | =P35-O35 | 
| 6 | -9000000 | -3800000 | -1900000 | =O36-N36 | =P36-O36 | 
| 7 | -9000000 | -3800000 | -1900000 | =O37-N37 | =P37-O37 | 
| 8 | -9000000 | -3800000 | -1900000 | =O38-N38 | =P38-O38 | 
| Incremental IRR | =IRR(Q30:Q38) | =IRR(R30:R38) | |||