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A new highway is to be constructed. Design A calls for a concrete pavement costing $90 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 culvers must be cleaned every five years at a cost of $450 each per mile. Design B call for a bituminous pavement costing $45 per foot with a 10-year life; two sodded ditches costing $1.50 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 Present Worth and Annual Worth methods using an MARR of 6 per year. For this problem, Develop the cash flow table for each design. Set up the flow equations but do not perform the numerical computations