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A new highway is to be constructed. Design A calls for a concrete pavement costing $70 per foot with a 20-year life; four paved

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A new highway is to be constructed. Design A calls for a concrete pavement costing $70 per foot with a 20-year life; four paved ditches costing $3 per foot each; and three box culverts every mile, each costing $7,000 and having a 20-year life. Annual maintenance will cost $1,900 per mile; the culverts must be cleaned every five years at a cost of $500 each per mile. Design B calls for a bituminous pavement costing $40 per foot with a 10-year life; four sodded ditches costing $1.30 per foot each; and three pipe culverts every mile, each costing $2,150 and having a 10-year life. The replacement culverts will cost $2,350 each. Annual maintenance will cost $2,800 per mile; the culverts must be cleaned yearly at a cost of $225 each per mile; and the annual ditch maintenance will cost $1.45 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. Click the icon to view the interest and annuity table for discrete compounding when the MARR is 6% per year. The AW value for Design A is $ /mi. (Round to the nearest hundreds.) The PW value for Design A is $ /mi. (Round to the nearest hundreds.) The AW value for Design B is $ /mi. (Round to the nearest hundreds.) The PW value for Design B is $ /mi. (Round to the nearest hundreds.) The most economical design on the basis of AW and PW is

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