1. Three mutually exclusive design alternatives are being considered. The estimated cash flows for each alternative are given next. The MARR is 20% per year. At the conclusion of the useful life, the investment will be sold. A decision-maker can select one of these alternatives or decide to select none of them. Make a recommendation using the PW method. B Investment cost $30,000 $50,000 $40,000 Annual expenses $15,000 $13,000 $22,000 Annual revenues $23,000 $28,000 $32,000 Market value $6,000 $8,000 $10,000 Useful life 10 years 10 years 10 years 26.4% 24.7% 22.4% IRR 2. A new highway is to be constructed. Design A calls for a concrete pavement costing $110 per foot with a 20- year life; two paved ditches costing $3 per foot each; and three box culverts every mile, each costing $9,000 and having a 20-year life. Annual maintenance will cost $1,800 per mile; the culverts must be cleaned every five years at a cost of $450 each per mile. (Imile= 5280foot) Design B calls for a bituminous pavement costing $45 per foot with a 10-year life; two sodded ditches costing $1.60 per foot each; and three pipe culverts every mile, each costing $2,250 and having a 10-year life. The replacement culverts will cost $2,400 each. Annual maintenance will cost $2,700 per mile; the culverts must be cleaned yearly at a cost of $225 each per mile; and the annual ditch maintenance will cost $1.50 per foot per ditch. Compare the two designs on the basis of equivalent worth per mile for a 20-year period. Find the most economical design on the basis of AW and PW if the MARR is 6% per year. 2. A new highway is to be constructed. Design A calls for a concrete pavement costing $110 per foot with a 20- year life; two paved ditches costing $3 per foot each; and three box culverts every mile, each costing $9,000 and having a 20-year life. Annual maintenance will cost $1,800 per mile; the culverts must be cleaned every five years at a cost of $450 each per mile. ( 1mile= 5280foot) Design B calls for a bituminous pavement costing $45 per foot with a 10-year life; two sodded ditches costing $1.60 per foot each; and three pipe culverts every mile, each costing $2,250 and having a 10-year life. The replacement culverts will cost $2,400 each. Annual maintenance will cost $2,700 per mile; the culverts must be cleaned yearly at a cost of $225 each per mile; and the annual ditch maintenance will cost $1.50 per foot per ditch. Compare the two designs on the basis of equivalent worth per mile for a 20-year period. Find the most economical design on the basis of AW and PW if the MARR is 6% per year