A new highway is to be constructed. Design A calls for a concrete pavement costing $75 per foot with a 16-year fife; three paved ditches costing $3 per foot each; and three box culverts every mile, each costing $7,000 and having a 16-year life. Annual maintenance will cost $1, 900 per mile; the culverts must be cleaned every four years at a cost of $300 each per mile. Design B calls for a bituminous pavement costing $35 per foot with a 8-year life; three paved ditches costing $1.60 per foot each; and four pipe culverts every mile, each costing $2, 300 and having a 8-year life. The replacement culverts will cost $2, 350 each. Annual maintenance will cost $2, 600 per mile; the culverts must be cleaned yearly at a cost of $235 each per mile; and the annual ditch maintenance will cost $1.30 per foot per ditch. Compare the two designs on the basis of equivalent worth per mile for a 16 year period. Find the most economical design on the basis of AW and PW if the MARR is 12% per year. The AW value for Design A is $/mi. The AW value for Design B is $/mi. The PW value for Design B is $/mi. The most economical design on the basis of AW and PW is . A new highway is to be constructed. Design A calls for a concrete pavement costing $75 per foot with a 16-year fife; three paved ditches costing $3 per foot each; and three box culverts every mile, each costing $7,000 and having a 16-year life. Annual maintenance will cost $1, 900 per mile; the culverts must be cleaned every four years at a cost of $300 each per mile. Design B calls for a bituminous pavement costing $35 per foot with a 8-year life; three paved ditches costing $1.60 per foot each; and four pipe culverts every mile, each costing $2, 300 and having a 8-year life. The replacement culverts will cost $2, 350 each. Annual maintenance will cost $2, 600 per mile; the culverts must be cleaned yearly at a cost of $235 each per mile; and the annual ditch maintenance will cost $1.30 per foot per ditch. Compare the two designs on the basis of equivalent worth per mile for a 16 year period. Find the most economical design on the basis of AW and PW if the MARR is 12% per year. The AW value for Design A is $/mi. The AW value for Design B is $/mi. The PW value for Design B is $/mi. The most economical design on the basis of AW and PW is