Final answer:
To find the conventional benefit-cost ratio for the toll road project, the present value of revenues is divided by the present value of costs using the provided investment, operating, and maintenance figures, factoring in the resurfacing costs and using the 12% MARR as the discount rate.
Step-by-step explanation:
Calculating the conventional benefit-cost (B-C) ratio for a toll road project involves determining the present value of benefits and dividing them by the present value of costs. In this case, we use the Minimum Acceptable Rate of Return (MARR) of 12% as the discount rate to calculate the present value of both costs and revenues over a 30-year period.
The initial investment is $21,000,000, and there is an annual operating and maintenance cost of $520,000. Additionally, the road requires resurfacing every fifth year, except for year 30, at a cost of $1,300,000. With a revenue of $2,500,000 per year, we need to consider resurfacing costs that occur at years 5, 10, 15, 20, and 25. The B-C ratio can be found using the formula for present value of annuities and adjusting for the additional resurfacing costs at their respective intervals.