The U.S. financial system is a(n) __________ system

Refer to Scenario 12.1. Suppose that a third friend, Ryan, joins Simon and Paula on their way home from school, and this reduces the probability of any particular individual from stepping forward to help the man being attacked from 70% to 60%

What is the probability of either Simon, Paula, Ryan, or any combination of the three trying to rescue the man? A) 21.6% B) 50.4% C) 72.0% D) 93.6%

Consider a car dealership advertises a three-year lease at $250 per month. When you arrive to apply, you discover that the lease requires a down payment of $3600 dollars. You will undertake the lease if

A) you value the lease at least $350 per month. B) you value the lease at least $250 per month, the $3600 is a sunk cost. C) you value the lease less than $350 per month. D) you value buying a new car at $400 per month.