4.
The Indiana Highway Department wants to construct a new rural
highway. The engineering team is considering two designs:
a. Design A calls for a concrete pavement costing $90/ft. with
a 20-year life, two paved ditches each costing $3/ft., three box
culverts each costing $9,000/mile, annual maintenance costs of
$1,800/mile, culvert cleaning costs of $450/mile every five years.
Design A has a 20-year life.
b. Design B calls for a bituminous pavement costing $45/ft.
with a 10-year life, two sodded...