Item	Data
Accidents per 100 000 000 vehicle-kilometers in 6 m lanes	150
Accidents per 100 000 000 vehicle-kilometers in 7.5 m lanes	90
Serious personal injuries per accident	10%
Average non-human cost per accident ($)	2500
Average cost of personal injuries per accident ($)	40 000
Annual road use (vehicles)	7 500 000
First cost per kilometer ($)	175 000
Operating and maintenance costs per kilometer/year ($)	7500
Project life (years)	25

MARR = 10%

Find the present worth of the savings of serious personal injury