Select the expression that equals-).
a- 3+(-5)
b- -3+(-5)
c- -3+5
d- 3+5

33%  ( A )

Step-by-step explanation:

Number of seats = 300

Ticket price = $450

passengers who reserve but don't show up : mean = 40 , Std = 14

net cost of involuntary boarding denial = $900

Determine the probability of not dealing with over booked passengers

Given ;

Net cost of Involuntary boarding denial ( Nd ) = $900

cost excess ticket ( Ct ) = $450

first step : determine the critical ratio

Cr = Nd / Ct + Nd

    = 900 / ( 900 + 450 )  = 0.67

Finally determine the Prob ( of not dealing with overbooked passengers )

= 1 - 0.67  = 0.33 = 33%