In: Economics
A city is considering buying a piece of land for $500.000 and construction an office complex on it. Their planning horizon is 20 years. Two mutually exclusive building designs have been drawn up by an architectural firm. Use the modified benefit cost ratio method and a MARR of 10% per year to determine which alternative should be recommended to the city council.
Design A (x1000$) | Design B (x1000$) | |
Cost of building including cost of the land | 1,107 | 1,306 |
Resale value of land and building at end of 20 year planning horizon | 655 | 893 |
Annual net rental income (after deducting all operating expenses) | 128 | 208 |
Perform the incremental B/C Analysis. Write the incremental B/C ratio for these alternatives.
Modified BC ratio= PW of Annual Rental income/(Initial cost-PW of salvage value)
PW of Annual rental income= Annual Rental Income*(1-(1+MARR)^-n)/MARR
PW of Resale Value= Resale Value /(1+MARR)^n
MARR=10%
n=20 years
Design A | Design B | Incremental cash flow | |
Cost of Building including Land C | 1107 | 1306 | 199 |
Resale Value at end of 20 years S | 655 | 893 | 238 |
Annual Rental Income P | 128 | 208 | 80 |
PW of Resale value A | 97.36 | 132.74 | 35.38 |
PW of Annual rental Income B | 1089.74 | 1770.82 | 681.09 |
C-A | 1009.64 | 1173.26 | 163.62 |
Modified B/C ratio | 1.08 | 1.51 | 4.16 |
As the B/C ratio of Design A is greater than 1.0, Design A now becomes the base alternative and is compared against the next higher equivalent cost alternative i.e. design B. Now the incremental benefits and incremental costs between B and A are calculated and the incremental B/C ratio is obtained. Incremental cash flow is obtained by subtracting cash flow of design A from Design B.
So modified incremental BC Ratio=4.16