A new highway is to be constructed. Design A calls for a concrete pavement costing $75 per foot with a 20 -year life. four paved ditches costing $3 per foot each, and three box culverts every mile, each costing $10,000 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 $350 each per mile Design 8 calls for a bituminous pavement costing $50 per foot with a 10 -year life, four sodded ditches costing $1.30 per foot each; and four pipe culverts every mile, each costing $2,150 and having a 10-year life The replacement culverts wilt cost $2,350 each. Annual maintenance will cost $2,700 per mile, the culverts must be cleaned yearly at a cost of $235 each per mile; and the annual ditch maintenance will cost $1.70 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 12% per year. Click the icon to view the interest and annuity table for discrete compounding when the MARR is 12% per year. The AW value for Desigri A is 5 imi. (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 5mi. (Round to the nearest hundreds.) The PW value for Design B is 5mi. (Round to the nearest hundreds.) The most economical design on the basis of AW and PW is