The first cost, life, and annual benefit for a prospective project are uncertain. Optimistic (OP), most likely (ML), and pessimistic(PS) estimates are given. If the interest rate is 25%, what is the present worth difference between a total worst case scenario and a total best case scenario?

Parameter	Pessimistic	Most Likely	Optimistic
Fist cost	150000	100000	80000
Annual benefit	25000	45000	50000
Project life	5	7	9

a) $15.8

b) $42.2

c) $181.3

d) $282.5